Re: function side effects

Peter Eisentraut <peter_e@gmx.net> writes:
> SQL standard:

> <SQL-data access indication> ::=
> NO SQL
> | CONTAINS SQL
> | READS SQL DATA
> | MODIFIES SQL DATA

Huh.  I understand three of those, but what is the use of CONTAINS SQL?
Seems like that would have to be the same as the last one, or maybe
the next-to-last one if you're prepared to assume it's read-only SQL.
        regards, tom lane