MySQL supports procedures and functions.
Functions can return results but cannot update the database.
Procedures can update the database but cannot return results.
However :
- a function can call a procedure that updates the database !
- a procedure can return result through OUT parameters !
It's a friggin mess. In pgsql, if you want, a STABLE or IMMUTABLE
procedure is a function since it is repeatable : it will always return the
same results with the same parameters, and has no side-effects. This is
the definition of a function.
It is better not to draw useless lines in the ground with huge "don't
walk over this line" stickers. People will always find a way around.
Better offer features that users need.
Is it true that postgres doesn't have a notion of Stored Procedures
and functions is what it has instead?
RDBMS like Sql Server supports both stored procedures and functions.
So I was wondering what is the difference between a Stored Procedure
and a function.
Pascal has functions and procedures. C has only functions. That doesn't
say anything about the relative usability of each language. Those are
just names.
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