How do I DECLARE a variable in SQL Server?

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Declaring a variable The DECLARE statement initializes a variable by assigning it a name and a data type. The variable name must start with the @ sign. In this example, the data type of the @model_year variable is SMALLINT . By default, when a variable is declared, its value is set to NULL .

How do you DECLARE a variable in SQL?

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 I DECLARE a variable in Microsoft 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.

How do you DECLARE a variable in a table?

To declare a table variable, you use the DECLARE statement as follows:1DECLARE @table_variable_name TABLE ( column_list ); ... 2DECLARE @product_table TABLE ( product_name VARCHAR(MAX) NOT NULL, brand_id INT NOT NULL, list_price DEC(11,2) NOT NULL );An Introduction to SQL Server Table Variables By Examples

What is VAR () in SQL Server?

The SQL VAR Function is an Aggregate Function, which is used to determine the statistical Variance of entire records (or rows) selected by the SELECT Statement. The syntax of the SQL Server VAR Function is SELECT VAR ([Column_Name]) FROM [Source]

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