use if and else in ms Sql code example

Example 1: else if sql server

IF (Expression 1)
BEGIN
   Statement 1;
END

ELSE IF (Expression 2)
BEGIN
   Statement 2;
END
..........
ELSE 
BEGIN
   Default Statement;
END

Example 2: how to do an if statement in sql server

DECLARE @Course_ID INT = 4

IF (@Course_ID = 4)
Select * from Guru99 where Tutorial_ID = 4
ELSE
Select * from Guru99 where Tutorial_ID != 4