Greg Wickham <greg(at)geelong(dot)com> writes:
> If I try the half intuitive approach
> z=> select groname from pg_group where grolist = 21;
> ERROR: Unable to identify an operator '=' for types '_int4' and 'int4'
> You will have to retype this query using an explicit cast
> The cause of my problem is the use of an array to store the user id's
> associated with a group. Not sure how to get around this.
You need a function that will return true if any of the elements of
an int4 array is equal to a particular int4 value. See contrib/array/
for one way to do it.
regards, tom lane