There is a cross join table needs to capture rows with at least one not null
value for specific columns:
where books.id is not null
or typings.id is not null
or translates.id is not null
is there any function or method to prevent duplicate not null
in that where clause?
something like this :
where at_Least_not_Null_One_Of(books.id,typigns.id,translates.id)
Use COALESCE
:
COALESCE(books.id,typigns.id,translates.id) IS NOT NULL