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8 Apr 2013 It's primarily useful if you are writing an ad-hoc query with a small enough table that One of these days Microsoft may allow variables in query
 30 Sep 2010 It's possible, but it requires using dynamic SQL. I recommend reading The curse and blessings of dynamic SQL before continuing DECLARE
 Using SQL Variables in Queries Problem You want to save a value from a query so you can refer to it in a subsequent query. Solution Use a SQL variable .
 You can store a value in a user-defined variable in one statement and refer to it . They cannot be used directly in an SQL statement as an identifier or as part of
 6 Sep 2017 However, when expression is the name of a column, it can return multiple values. If the SELECT statement returns more than one value, the variable is assigned the last value that is returned. If the SELECT statement returns no rows, the variable retains its present value.
 The syntax to declare variables in SQL Server using the DECLARE statement is: DECLARE @variable_name datatype [ = initial_value ], @variable_name
 SELECT When Assigning Variables. There are 2 ways of assigning a value to a local variable previously created with the DECLARE @LocalVariable statement,
 
 You can define variables within SQL Workbench/J that can be referenced in your SQL statements. This is done through the internal command WbVarDef .
 Variables in SQL procedures are defined by using the DECLARE statement. Values can be assigned to variables using the SET statement or the SELECT INTO statement or as a default value when the variable is declared. Literals, expressions, the result of a query, and special register values can be assigned to variables.
     
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