Обсуждение: SQL Question

I'm trying to do some type of conditional select statement and I have no
idea how.

What I would like is something like this (using pseudo sql)

select (if(col1>1) true else if (col1<= 1) false) from foo;

does that make sense?  Basically I want one column of my result set to be
true or false based on some logic.  I can do it in code and have my program
handle it, but I was hoping to do it in SQL.

Thanks,

Matt O'Connor

Matthew <matt@ctlno.com> writes:
> What I would like is something like this (using pseudo sql)
> select (if(col1>1) true else if (col1<= 1) false) from foo;

This particular example could be written as just

    select col1>1 from foo

since a boolean result is a perfectly good result.

More generally, you could use the CASE construct for conditional
expressions.  See
http://www.postgresql.org/devel-corner/docs/postgres/functions-conditional.html

            regards, tom lane