Sql query with dynamic column name in where clause. When I use it in where clause like.

Sql query with dynamic column name in where clause Meaning with this answer you can dynamically calculate the column names instead of just reading in raw values. As conditions you can use any value, but so far Excel didn't allow me to use what I call "SQL Apostrophes" (´), so a column title in one word is recommended. v_col varchar2(100) := 'deptId'; v_dept varchar2(100); begin. As you might imagine, we can do the Dec 31, 2024 · Dynamic SQL by writing a query with parameters. While a Pure SQL Method may be possible it will be dynamic SQL and code maintnence would be a nightmare. 0. They will, logically enough, also require dynamic SQL. Query<Person>() will invoke Dapper passing the underlying SQL and parameters - and the underlying query is fully parametrized SQL (WHERE FirstName = @p0 AND LastName = @p1, etc). functions import col df. The variable Below is a quick example of how to do it via Dynamic SQL. DECLARE @value varchar(10) SET @value = 'intStep' SELECT @value FROM dbo. Executing cte you can add dynamic fields and condition by using CONCAT() MySQL function. using OR and Dynamic sql Query lead us to performance hit, It seems the best bet is using IF . @NamedQuery and @NamedNativeQuery annotations. These values are passed to a copy data (within a ForEach) In the copy data i use a Dynamic query statement like: @concat('select a. You can reference the outer table in the subquery in the WHERE clause, 3rd – Dynamic SQL. C. For a pure numeric array, use the appropriate type conversion viz intval or floatval or doubleval over each element. For string types mysqli_real_escape_string() which may also be applied to numeric values if you wish. If however dynamic SQL is not something that you feel comfortable with then you might just go with method #2. But when I give variable - its giving out put of Column Name itself. Conversely, because the SELECT clause is step 8, any column aliases or derived columns defined in that clause cannot be referenced by preceding clauses. the wildcard-symbol is PART of the SEARCH expression, not part of the sql-query. Contains(param) select res; return query; } } Example 7-2 Dynamic SQL Procedure that Accepts Table Name and WHERE Clause. group by 2, order by 1 would get you one row per column 2 (whether a field name or an expression) and order it by column 1 (field or expression) also: some RDBMS's do let you refer to the column alias as you first attempted try using COALESCE function to get your rows in one column with comma separeted. UserRolesBitmask & role) == role select user; I am working on a select statement in SQL and am running into issues trying to create a where clause that includes a case statement or an if else statement. Making dynamic SQL queries to a MySQL DB. This flexibility allows developers to create adaptable queries based on user inputs or application logic, facilitating dynamic filtering, sorting, and schema modifications while enhancing code reusability and performance. If you append it via string concatanation on database-level, you get an unreusable query-string – The first param of . Example: Consider employe table with 5 columns as Emp Id , Frst name, Lst Name, Addrss, Phn Num. This is was actually super easy in SQL server alsoEND AS column_name +1 – N101Seggwaye. The SQL WHERE Clause. WHERE u. In this article, we will SQL Aliases. As of MySQL 8. Please refer attached Image for Code & Results ( Expected & Current ) Code : A derived table cannot normally refer to (depend on) columns of preceding tables in the same FROM clause. Using dynamic SQL, the statements (partial) needed to create the query are shown here. declare @QualIDs varchar(50)='' select @QualIDs= COALESCE(@QualIDs+ ', ', '') + CAST(Qualiid AS varchar(50))) from tblQualificationMaster this will return all Qualiid with comma separated you can use it in where clause or in sub query. SQL aliases are used to give a table, or a column in a table, a temporary name. I checked this is working fine. DELIMITER $$ /*define procedure name*/ CREATE PROCEDURE getSearchData() BEGIN DECLARE conditions varchar(1000); DECLARE selectField varchar(1000); DECLARE SQL_QUERY varchar(1000); /*define default select and condition*/ As we can easily guess, @0 and @1 are placeholders for variables, just like {0} and {1} for the String. You can use the BULK COLLECT INTO clause with the EXECUTE IMMEDIATE statement to store values from each column of a query's result set in a separate collection. But 2) Using dynamically concatenated TSQL. Execute a query as a column using the results from another column-1. I need to query database to get the search results. One of the best ways to understand the performance of a SQL query is to look at how I have a Lookup that retrieves a few records from a MS SQL table containing schema, table name and a whole where clause. For instance, naming a method findByRentalRateBetween() in your Film I think that MySql and MsSql won't allow this because they will try to find all columns in the CASE clause as columns of the tables in the WHERE clause. How I can do this? public IEnumerable MyTable MySelect(string colName, string param) { using (MyEntities db = new MyEntities ()) { var query = from res in db. Here's a stored procedure that parses the JSON and inserts it in a table: create or alter procedure dbo. Add a comment | SQL Server dynamic PIVOT query? 0. Using LINQ to SQL with Dynamic tables. You can use sp_executesql to build up SQL dynamically as per below. The resulting SQL query’s WHERE clause or even the number of table joins change based on the user input. colName. item = B. When I see an in with two columns, I can imagine it to mean two things: The value of column a and column b appear in the other table independently; The values of column a and column b appear in the other table together on the same row I need some help with my SQL logic, and I've been working (and researching) this for 2 days now with zero success. Parameters are automatically captured from The original query did not use dynamic SQL, but I introduced a dynamic database name for the sake of the example for this section. In fact, you can use parameters only for values — not for column names, or expressions, or SQL keywords or anything else. :. I am creating a parameterized apex form where I take column name and its value from user via a select list. I have dropdowns that relate to columns of that mySQL table - when the user selects one of the dropdowns it uses AJAX to query the database. public IOrderedQueryable<ProductDetail> GetProductList(string productGroupName, then search on the Active column else ignore the filtering on the Active column. query = query. For demo purpose, I used the Product table from the AdventureWorksLT database. COLUMNS WHERE Table_Name = @tableName; -- in loop (can't be bothered to include the code!) Dynamic WHERE clause in T-SQL. s_dt dt01 dt02 dt03 2015-10-26 I want dt01 value to display as column name 26 and dt02 column value will be 26+1=27 I want to use Variable column name in Select Statement. When a user selects a column name i want to add a where clause to the query to use this filter. Hot Network Questions Replacing a PVC We should take care of SQL injection vulnerabilities and an empty condition. Dynamic. Now we need a sql which can Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company If you need a general column name as result, you can add an alias: (@DynamicSQL) /* SELECT DailyValue = P. EDIT: By the way, making my Google search query more accurate, i found a bunch of things related to my problem, probably i will try to use it now. query That would require a 4 argument clause (column, operator, value1, value2) - or at least some way of turning your 2 dates into a suitable value. Note : My data in column is INT but Column Heading is Varchar. When performance is the top priority, then one should avoid using Dynamic SQL statement. gorp package (snippets thing sounds very promising) The physloc column is included just to demonstrate that the table variable referenced in the child scope is definitely the Here is an example of using a dynamic T-SQL query and then extracting the results should you have more than one column of returned values (notice the dynamic table name): DECLARE @strSQLMain nvarchar(1000), @recAPD Thought of dynamic sql but it bring other problems like maintenance, code clearance, etc. My goal is to try an pass a variable from an ASP page to a stored procedure, which is utilizing the variable as criteria for a column name in the where clause. Bedrijfsnaam Select wc) 'if dropdown has value How to do a where clause based on a column existing or not. IF OBJECT_ID('tempdb. Dynamic column name in WHERE clause using MyBatis. Call a java method to generate SQL query in myBatis. Refer to a column name alias in the WHERE clause. Ask Question Asked 8 years, 3 months ago. Provided that you parameterize the variables you should be safe from issues like SQL injection and The Having clause works as a post filter after grouping and can use aliases from the query, although I'm afraid you will need to have an actual group by clause (not sure). select column_name from INFORMATION_SCHEMA. singletonMap("name", "name")); But you have to make sure that your query WHERE is such that the Query will always return 1 result only. SQL Provides various operators to query the data from the database. Dim query As IEnumerable(Of DataRow) = From x In tab. Provided that you parameterize the variables you should be safe from issues like SQL injection and What is the best way to assemble a dynamic WHERE clause to a LINQ statement?. If you want to include the blanks space in the object name or column name, the query and application code must be written differently. ADO / manual query building. The fourth ` appears to be due to the LIKE` clause being used, based on Barmar's answer, but this answer lacks that information. SELECT column1, column2, FROM table_name WHERE condition; Note: The WHERE clause is not only used in SELECT statements, it is also used in UPDATE, DELETE, etc. If you like dynamic SQL and use it on a regular basis then this one is nice and easy and certainly my favorite. describe_t. isin({"foo", "bar"})). In practice DataFrame DSL is a much better choice when you want to create dynamic queries: from pyspark. It uses one form of dynamic SQL for most of it and another form for passing the impassible database name for the FROM clause. The alternative is to have a sub-select (derived table or select in select), where you first select the distances for each row, and then select only the relevant distances IN WITH MULTIPLE COLUMNS DOES NOT EXIST, THINK CAREFULLY WHAT YOU WANT. On SQL 2008, you will get additional errors due to the use of IIF. UserName IN (cat) -- cat is taking as a column name here WHERE u. How can i achieve this? Please help. MySQL allows numbers as well as date variants as string. g. Dynamic SQL example: where the request parameters category, minRentalRate, maxRentalRate, and releaseYear might be optional. select columnnames from table where :P592_column = :P592_value ; It is not returning any output, but when I hardcode column name in place of :P592_column it is showing output. DECLARE @param TABLE (id int) INSERT INTO @param VALUES (1), (2), (3) ;WITH Sales_CTE (SalesPersonID, SalesOrderID, SalesYear) AS ( SELECT SalesPersonID, SalesOrderID, YEAR(OrderDate) AS SalesYear FROM Sales. select 1 into v_dept from I've created a dropdown with some column names in a table in my db. Example 7-5 Dynamic SQL with BULK COLLECT INTO Clause. I am going to handle both as below. As per the given table data, the non-null field in first row is “Field1”. Is there a way I can dynamically choose the correct column to put in a WHERE clause? I can get the current SELECT CASE WHEN @flag1 = 1 THEN #{COLUMN_VALUE} END AS col1, CASE WHEN @flag1 <> 1 THEN #{COLUMN_VALUE} END AS col2 FROM declare db_cursor cursor local for. These values are passed to a copy data (within a ForEach) In the copy data i use a Dynamic So, the code here is pretty self explanatory, but just to quickly walk you through the logic - I have declared a list of strings named and_clause which will store the query_param dictionary keys to be used as column names and query_param dictionary values as the actual value to be searched for seperated by = to structure it like a SQL query. When this happens you will need to do the pivot using GROUP BY. The values can be in any type since it's interface{}. It is entered by the USER (or, if wildcard-search is predefined, is appended to the users search expression input). dealer_telefonies Order By wc. Try it Yourself » Syntax. What i'm trying to do is: Dim objQuery = (From wc In _dbBellen. Format method. I use CTEs to help compose complicated SQL queries You can't use a variable in an IN clause - you need to use dynamic SQL, or use a function (TSQL or CLR) to convert the list of values into a table. – TylerH. You must replace the TABLE argument with the DBMS_TF. COLUMNS. Field1 = Parameter1 note: for mysql at least: order by and group by you can use column (or expression) positions. shm_nam,'. InsertJson(@json nvarchar(max)) as begin declare @id int I have a table where a column allows special characters like '/' (forward slash) and '' (back slash). I want to select records based on the value of a variable. It would be more readable but more expensive operation. build the dynamic SQL and get a data table; Dynamic where clause in LINQ - with column names available at runtime. Without it, SQL queries would return all rows in a table, making it difficult to target specific data. The column names need to be known at compile time, so you will need to use dynamic sql. they don't want to filter by that column). declare. DECLARE @sql varchar(max) declare @list varchar(256) select @list = '1,2,3' SELECT @sql = 'SELECT * FROM myTable WHERE myColumn in (' + @list + ')' exec sp_executeSQL @sql 3) A possible third option is table variables. SET @MemberNames = '''cat''' Difference in the resulted query is . This where clause will have something like ‘where SQL Aliases. For those who interested too: old go playground example. findOne("name = :name", Collections. SELECT C_FirstName, C_LastName, C_UserName, C_UserID FROM CUSTOMER WHERE (FirstN IS NULL OR C_FirstName LIKE FirstN) AND (LastN IS NULL OR C_LastName LIKE LastN) AND (CUserName IS NULL OR C_UserName Plain JPA Named Queries using: orm. public IOrderedQueryable<ProductDetail> GetProductList(string productGroupName, Summary: Dynamic SQL is a powerful feature in SQL Server that enables the construction and execution of SQL queries at runtime. In PL/SQL, you need dynamic SQL to run: SQL whose text is unknown at compile time. Remember, cleaner and more precise code is always the best option. SQL that is not supported as static SQL. 1. Thus, dynamic SQL lets you write highly flexible applications. Do you really need a dynamic sql query? Dynamic sql is both risky and slow to perform, I suggest to avoid it whenever possible, even if it means writing more code. Using plain JDBC, there are two options to achieve this. Let’s say we have a simple example where need to find all records from the customers table where City = ‘London’. If the variable is 'True' then only return records from the select statement where a column is null. An operator is a reserved keyword that is used in the query so that it can generate specific output for the application. Please find sample code segment I am trying to run: Plain JPA Named Queries using: orm. In this article, we are going to learn how we can write a SQL query with space in the column name. count() ## 2 The query is dynamically generated, The only reason the accepted answer works is because the column the WHERE clause is on actually exists on the joined table which does not address an alias of a query created column such as an alias of a sub-query. where(col("v"). If there is more than Please look at the below query. Concatenating a SQL string query in a JSP file. For each group, generate a series of SQL statements (in a variable) that will add the group name and Using dynamic SQL inside stored procedures. Item(desc)) In the stored procedure, I want to construct a SQL with a dynamic WHERE clause to fetch ReportIds. ! Demo Database. I need to figure out how to build the query dynamically because sometimes the dropdowns will be empty (i. First, copy your dictionary into a table in SQL Server - I'll refer to it as I've got a table that holds columns named "Day1" through to "Day31". column_name [, ] is an optional Dec 27, 2014 · The following code will do it. You also may want to declare your @sql variable as something bigger than 100 characters! Looks like your string is getting truncated. Where() accepts string and the rest is variadic, this means you have the capability to modify the query and the values. When I use it in where clause like. Output: Explanation. For example, if the query processor can bind to (access) the tables or views defined in the FROM clause, these objects and their columns are made available to all subsequent steps. Despite its awesomeness, the System. . Read this. Whether we’re working on aggregating data, analyzing large datasets, or building complex reports, Employee Name; Employee Id; Date of joining; Department; etc. I tried successfully for parameter as following: /* Using sp_executesql */ /* Build and Execute a Transact-SQL String with a single parameter value Using sp_executesql Command */ /* Variable Declaration */ DECLARE @EmpID AS SMALLINT DECLARE @SQLQuery AS NVARCHAR(500) DECLARE @ParameterDefinition AS Rather, you want the query plan to be different depending on user input. Unfortunately you cannot bind a list like this, however you can use a table function. If you must use dynamic sql, try this: set @sql ='select * from users where userid = isnull('+ COALESCE(@suerid, 'null') +',@suerid)' EDIT: Actually, this will AND the where clauses and you wanted to OR them. ELSE or Case statement ,I think By this way two execution plan would be make and would be cached , I had such a question I've done this when creating some dynamic data for a Word mail merge. Sep 29, 2019 · As we can easily guess, @0 and @1 are placeholders for variables, just like {0} and {1} for the String. However, some dynamic queries require complex coding, the use of special data structures, and more run-time processing. x = B. Whether you’re retrieving data, updating records, or deleting entries from a database, the WHERE clause plays an important role in defining which rows will be affected by the query. Commented Nov 23, 2023 at 23:09. I have the following simple select statement:. You can write a static SQL query and add the hint OPTION (RECOMPILE) which forces SQL Server to compile the query every time. tblBatchDetail I want to set table name in a dynamic SQL query. Hibernate with the JDBC driver for Oracle support both of these features. Select in select query in SQL Server. The plan is to have two parameters one is for where clause. The following approach (a inner join) works in LINQ to Objects but can not be translated to SQL with LINQ to SQL: var result = from user in Users from role in UserRoles where (user. Core alone was not enough for my You need to pass it as a string to the dynamic query. 2. All we have to do is set the value of the nativeQuery attribute to true and define the native SQL query in the value attribute of the annotation: @Query( value = "SELECT * Jan 21, 2024 · 在数据库查询中，遇到“Unknown column ‘xxx’ in ‘where clause’”错误通常意味着你在查询中引用了一个不存在的列。 这个错误可能是由于以下原因造成的： 列名拼写错误：检查查询中的列名是否拼写正确，包括大小写和特殊字符。列名不存在：确认你要查询的表中是否真的存 Oct 16, 2023 · And we are not repeating our column name “firstname” repeatedly. DECLARE @SQL varchar(1000) SET @SQL = 'SELECT Cus_Name, Cus_City, SQL String is the string that contains the SQL Statement using variables to represent dynamic elements like table names, column names, or conditions in the 'WHERE' clause. One option to write dynamic SQL queries in your Spring Data JPA repositories is to use Spring Data JPA Specification and Criteria API. Named parameters in native queries also aren't part of the JPA specification. An alias only exists for the duration of that query. Hi All, I have query which has 20 columns along with alias names for the column. Following is the example of using dynamic SQL inside a stored procedure. Linq. Some approaches I have seen: 1) Use CASE combined with boolean operators: WHERE OrderNumber = CASE WHEN (IsNumeric(@OrderNumber) = 1) THEN CONVERT(INT, @OrderNumber) ELSE -9999 -- Some numeric value that just cannot exist in the column END OR FirstName LIKE CASE WHEN According to Oracle's documentation linked to in the answer, "To write a query that performs an outer join of tables A and B and returns all rows from A (a left outer join), use the LEFT [OUTER] JOIN syntax in the FROM clause, or apply the outer join operator (+) to all columns of B in the join condition in the WHERE clause. this is a simple examle. 0. where_clause ) You don't necessarily need dynamic SQL just because certain where conditions don't apply when they are not present. The WHERE clause in SQL queries filters data based on a specified expression or condition. AND ColumnB = ''' + @ColumnB + '''' I have query which has 20 columns along with alias names for the column. This is very similar to WHERE 1=1, however it includes the column name, which my solution required, and maybe a few others will require as well. If you have SQl Server 2005 you can use a table variable. item AND A. This first approach is pretty straight forward if you only need to pass parameters into your WHERE clause of your SQL statement in Microsoft SQL Server. The WHERE clause will put a AND operator between all NON NULL fields and compare with the passed parameters. User found = userRepository. I want to generate [Employee Name] dynamically based on other column value. Commented Jan 4, 2021 at 12:41. First, copy your dictionary into a table in SQL Server - I'll refer to it as Group_Def, with columns Group_Name and Where_Clause. SQL WHERE NOT IN Clause with an Array. In which ever field the user enters single values or ranges,i should pick that field dynamically and pass that field along with value range to Where condition of Select statement. Here's an example of usage based on your code: declare cursor c_get_csv_as_tables is select in_list(food_list) food_list from emp_food where emp_type = 'PERM'; cursor c_get_food_list (v_food_table varchar2Table)is select column_value food from // Materialize (and execute) the query var filteredUsers = usersQuery. The fetch_rows procedure must also have the same What is the best way to assemble a dynamic WHERE clause to a LINQ statement?. [Day3] FROM #PivotedInfo AS P */ You can avoid using dynamic SQL if you unpivot your columns and then filter where the unpivot column name matches your wanted day. To specify multiple possible values for a column: Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company . -- This Method is used when your Column names are dynamic -- We need to create a dynamic query and Execute it as shown below. Building the query template dynamically according to the number of items in the array and expanding the ids array into the query parameters array (which in my actual case also contains other parameters besides the list of ids) seems unreasonably burdensome. ColumnA, ColumnB. Note: to get the output described in this section, you need to have SQL 2012 or later. Derived Queries from method names. Option 1: replicate your logic in SQL. Regards K Srinivas You have to use a table variable instead of a NVARCHAR, e. Their behavior depends on the persistence provider and/or the JDBC driver. To use the operators within the query, we use the Jul 3, 2018 · Use DATEPART DAY to retrieve today's day, then build a simple dynamic SQL concatenating that day's value to the column name. How can I have that in a simple condition instead of checking each parameter seperately and then building the where clause expression_name (column_1, , column_n): The name of the virtual temporary data set which will be used in the main query, and column_1 to column_n are the column names that can be used in subsequent query steps. See this post The describe function must have the same parameters as the PTF itself, with one subtle difference. If you have users listed in a table called "Users", and the id is in a column titled "id" and the name in a column titled "Name", your query will look like this: The IDs are put in an IN() clause in the correct order. See the example below. Here is the sample table. I have several dozen checkboxes on a form and am passing them back as: Dictionary<string, List<string>> (specifically, Dictionary<fieldName, List<values>>) to my LINQ query. Given a (simplified) stored procedure such as this: CREATE PROCEDURE WeeklyProc(@endDate DATE) AS BEGIN DECLARE @startDate DATE = DATEADD(DAY, -6, @endDate) SELECT -- Stuff FROM Sale WHERE SaleDate BETWEEN @startDate AND @endDate END Hi, I have 10 fields on selection-screeen. We usually define a static condition or value, however, if you need to filter data based on different conditions, this can be I have a Lookup that retrieves a few records from a MS SQL table containing schema, table name and a whole where clause. For instance, naming a method I want to dynamically place column name in my select-query. Writing code using query parameters is easier than not using parameters, because it makes your code easier to write and easier to read. There are two ways to achieve this. AsEnumerable() Now, you want to create an IEnumerable(Of String) with your Select, which is fine. xml’s <named-query /> and <named-native-query />. Postgresql WHERE with age I am working on PL/SQL code where I need to perform a select query using variable as column name in where clause. ',item(). 3. So it'd be something like (extremely simplified): SELECT id FROM table1 WHERE ORDER BY display_order, name SELECT name, description, WHERE id IN ([id's from first]) The issue is that the second query does not return the results in the same order that the IDs are put into the IN SET @SQLQuery = 'SELECT * from [tblApps] WHERE [firstName] LIKE ''%'' + @search + ''%''' exec sp_executesql @query=@SQLQuery, @params=N'@search nvarchar(96)', @search=@search The only difference from this version as compared to the others is that the dynamic execution of the sql is in fact parameterized which mitigates sql injection a bit. When you require a lot of columns or columns with large sizes, you will hit the row size limit for the PIVOT function. UserName IN ('cat') -- cat is taking as a string here To do it using the approach you are trying, you'd need to encapsulate the whole query into a dynamic sql statement that builds up the CTE (WITH statement) dynamically, appending @V_QUERY to that dynamic sql statement. Prepare SQL query by Pass in the ORDER BY clause as a parameter to the stored procedure. – Michael. Is it possible to dynamically limit the number of columns returned from a LINQ to SQL query? I have a database SQL View with over 50 columns. columns SQL Server Extend dynamic SQL query with where part Is it possible to generate arbitrary where conditions SQL query through JDBC template? example: If I pass value for 1 parameter (only name) : search by name "select * from address where shopname = ?"; If I pass value for 2 parameter (name and city) - search by shopname and city: "select * from address where shopname = ? and city = ?"; Possible Duplicate: SQL: Select dynamic column name based on variable. This stored procedure is used to search for products based on different columns like name, color, productid, and the product number. How do I build a dynamic Where clause with Dapper when passing in a model. You don't need a subquery for that: SELECT item1, * FROM TableA A INNER JOIN TableB B ON A. Speed, performance and reusability are the known issues with Dynamic SQL. What is the best way to do this? Dynamic SQL by writing a query with parameters. Blanks spaces are restricted in the naming convention of the database object’s name and column name of the table. The describe function must also have a return type of DBMS_TF. Some constructive ideas for dealing with dynamic SQL and flexible WHERE clauses: Protecting Yourself from SQL Injection - Part 1 You might have to include a fixed list of possible column names as the user that the application is running as may not be able to select from sys. For example, a SELECT statement that includes an identifier that is unknown at compile time (such as a table name) or a WHERE clause in which the number of subclauses is unknown at compile time. User can provide one or more search criteria. something like This sounds prime for a front end display solution. column_t. So the WHERE clause will be . I have a dynamic query which I call and I put the Result set in a variable table = ''§name'' THEN [Value] END [§name])' -- Get columns: SELECT Column_Name INTO #cols FROM INFORMATION_SCHEMA. e. AND ColumnA = ''' + @ColumnA + '''' END IF(@ColumnB IS NULL) BEGIN SET @SQL = @SQL + ' . Column names are stored in a table as varchar and I am using a loop to pass those column names to my select statement. An alias is created with the AS keyword. challenge is how to write where clause dynamically at run time. It's implied that the query will treat it as a single scalar value, not a column name. There are a number of ways to do this purely in SQL. 14, a derived table may be defined as a lateral derived table to specify that such references are permitted. In the below example, I've prepared field1 & field2, and also value1 & value2 for representing the names of the fields I want to filter and their values respectively. 4. But you try to asign the result, which is of type IEnumerable(Of String), to query, which is of type IEnumerable(Of DataRow). Aliases are often used to make column names more readable. where TABLE_NAME = @table and TABLE_SCHEMA I have to pass the column name in the where clause in the below sql query. I use CTEs to help compose complicated SQL queries A more complex program might allow users to choose from menus listing SQL operations, table and view names, column names, and so on. sql. Here I would like to show few ways of Implementing Dynamic WHERE-Clause in 1 day ago · Comprehensive information about using SELECT and the SQL language is beyond the For an example of creating a database, creating a table, and running a SELECT query on the table in Athena, see Get Each subquery must have a table name that can be referenced in the FROM clause. The SQL WITH clause, also known as Common Table Expressions (CTEs), is a powerful tool that simplifies complex SQL queries, improves readability, and enhances performance by defining temporary result sets that can be reused multiple times. My requirement is to create a procedure or SQL query in which where clause should be created in run time depending on the paramters provided by the user. ToList(); For complex queries, you may want to look at PredicateBuilder. tab_nam, item(). I think that MySql and MsSql won't allow this because they will try to find all columns in the CASE clause as columns of the tables in the WHERE clause. table_t type and any COLUMNS arguments with DBMS_TF. e. select name as [Employee Name] from table name. Obviously this is not something you would use in a "real" SQL environment due to security considerations but it shouldn't matter here. MyTable where res. x; I can't think of a scenario where you would need to JOIN on a subquery with a filter like that where it wouldn't be equivalent to just reference the field directly in the outer query. If the possible values for @pi_colName are finite, the data type is always string, and the columns are collation compatible, you could do something like this and avoid dynamic SQL: SELECT There are a number of ways to do this purely in SQL. Core alone was not enough for my Nov 8, 2007 · It is impossible for the SQL Server to reuse the execution plans produced by the dynamic SQL statement. Select(Of String)(Function(x As Object) x. That is, any SQL construct not included in Dec 3, 2024 · The SQL WHERE clause allows to filtering of records in queries. // Materialize (and execute) the query var filteredUsers = usersQuery. Or you can use dynamic SQL to build a query string which includes only the search conditions the user specified. Commented Jul 18, 2017 at 7:09. SQL: SELECT statement with column names taken from different table (SQL Server 2012) SQL query pass column name dynamically. #PivotedInfo') IS NOT NULL DROP TABLE #PivotedInfo CREATE TABLE #PivotedInfo ( Day1 INT, Day2 INT, Day3 INT, Day4 INT) DECLARE @DayToday INT = DATEPART(DAY, GETDATE()) Apr 12, 2024 · We can use also native SQL to define our query. Select dynamic column based on rows in select query. In the stored procedure, build up the SQL statement in a string and then execute this statement using EXEC or sp_ExecuteSql. For anyone who NEEDS the column name in the query for whatever reason (probably dynamic SQL), a nice alternative would be SELECT * FROM table WHERE column = column. Mybatis passing multiple values to query. *, current_date as crt_tms from ',item(). SalesOrderHeader WHERE SalesPersonID IN see my answer (currently below). There isn't a good way to do this in SQL. Query 1 would pull back your data, Query 2 would pull back the column names and in code when you build what ever structure you use to display you set the headers from the second query. rqlpl myzj pzqeu wcqswt evha ncph elecus iujozy hugx gccqyd