Declare declaration variables in SQL

Source: Internet
Author: User

Add a variable to the SQL statement.

DECLARE @local_variable data_type

Declaration requires the type of the variable to be specified.

can use set and select to assign a value to a variable,

You can use @local_variable to invoke variables in SQL statements

A value can be supplied in the declaration, otherwise all variables are initialized to null after the declaration.

For example: declare @id int

DECLARE @id int = 3

Set @id =2

Select ID

Select @id = column_id from table where Column_user = ' ABC '

Declare declaration variables in SQL

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