IsNull can be used to test whether a geometry instance is null.IsNull returns 0 if the instance isn't null, but null if the instance is null.. This method is primarily used by the SQL Server ...

You would use Is Null and Is Not Null in query expressions and SQL WHERE clauses. IsNull(), on the other hand, is a Visual Basic for Applications (VBA) function and would be used only in VBA modules.

If you only want to update values in table A when there are matching records in table B, then an inner join is the way to go. If you have calculations that need to vary based on optional data, the ...

Implement ISNULL variant of COALESCE which takes only 2 arguments and is used by MS-SQL server. Relates to #34956 ...