create variables in sql code example

Example 1: sql declare variable

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

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

Example 2: sql declare table variable

DECLARE @TABLE TABLE( COL1 INT, COL2 VARCHAR(30))

Example 3: how to declare a variable in sql

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