define a variable in sql server code example

Example 1: sql declare variable

-- Declare the variable to be used.
DECLARE @MyCounter int;

-- Initialize the variable.
SET @MyCounter = 0;

Example 2: how to declare a variable in sql

DECLARE @COURSE_ID AS INT, @COURSE_NAME VARCHAR (10);

Example 3: declare value in sql

DECLARE  { @LOCAL_VARIABLE[AS] data_type  [ = value ] }