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8 lip 2024 · A Transact-SQL local variable is an object that can hold a single data value of a specific type. Variables in batches and scripts are typically used: As a counter either to count the number of times a loop is performed, or to control how many times the loop is performed. To hold a data value to be tested by a control-of-flow statement.
23 maj 2023 · Variables are declared in the body of a batch or procedure with the DECLARE statement and are assigned values by using either a SET or SELECT statement. Cursor variables can be declared with this statement and used with other cursor-related statements.
All the other answers here show how to set a variable using the output of a SELECT statement. Here's how to do it with a simple string: DECLARE @ModelID varchar(60) = 'Model T'
By using variables, developers can write more flexible and dynamic SQL queries, enhancing the capability to handle data dynamically during runtime. Understanding how to declare, initialize, and manipulate variables is fundamental for anyone looking to master SQL Server programming.
18 lis 2019 · Learn how to declare, assign and use local variables in SQL Server with examples. Find out the scope, data types and tips of SQL variables.
20 lip 2023 · In summary, this article has shown how to leverage T-SQL local variables in a SQL query. There are advanced use cases of this topic that you should check out. If you are interested in learning more, please see the "Next Steps" in this article to follow links to read more.
3 wrz 2024 · SELECT @ local_variable is typically used to return a single value into the variable. 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.
