ISNULL ( check_expression , replacement_value )
In SQL Server, this replaces NULL with the specified replacement value, if the value of the check_expression is NULL

Even MYSQL has the same function, but it does a different task & even the syntax is different.

I want to achieve the same task of SQL Server ISNULL() function
Please help !!!

that's because ISNULL is a non-standard SQL function

you should be using COALESCE instead, in both SQL Server and MySQL

that's because COALESCE is a standard SQL function