The different use of ISNULL functions in Transact-SQL and VBS

sql| function

Just looked at the functions isnull in the SQL Server section of Transact-SQL Reference online documentation and found that there are different uses of the common IsNull function:

The isnull syntax described in the VBS is ISNULL (expression);

In MSSQL T-SQL, however, such use occurs: ISNULL (check_expression, Replacement_value), which is described in the online documentation as:

Parameters

Check_expression

An expression that will be checked for null. Check_expression can be of any type.

Replacement_value

An expression to be returned when check_expression is null. Replacement_value must have the same type as check_expresssion.

found that the IsNull in T-SQL is more flexible, shared out, so as to learn T-SQL friend for reference.