How do you write a variable in SQL query?

Question

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.

How do you DECLARE a variable number in SQL?

For example: DECLARE @site_value INT = 10; This variable declaration example would declare a variable called @site_value that is an INT datatype. It would then set the value of the @techonthenet variable to the integer value fo 10.

How can use variable in SQL query in SQL Server?

Firstly, if we want to use a variable in SQL Server, we have to declare it. The DECLARE statement is used to declare a variable in SQL Server. In the second step, we have to specify the name of the variable. Local variable names have to start with an at (@) sign because this rule is a syntax necessity.

What are SQL variables?

A variable is an object that holds a single value of a specific type e.g., integer, date, or varying character string. We typically use variables in the following cases: As a loop counter to count the number of times a loop is performed. To hold a value to be tested by a control-of-flow statement such as WHILE .

How do you assign a column value to a variable in SQL?

Try these statements:1set @sql = N'select top(1) @location = location FROM dbo. productcategory order by ProductCategoryID desc'2exec sys. sp_executesql @sql, @params = N'@location nvarchar(50) OUTPUT', @location = @location OUTPUT.

Expert · Answer