Use it as
Declare @num int
Set @num =1
SELECT * FROM USERLOGIN
WHERE USERNAME=@username AND PWD=@PWD
AND level = @num
if you are using SQL server below 2008
or like
Declare @num int=1
SELECT * FROM USERLOGIN
WHERE USERNAME=@username AND PWD=@PWD
AND level = @num
for SQL Server 2008 and above
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solved Getting error in stored procedure for checkUser for login