[vox-tech] SQL help - unions

[Rod Roark]

On Tuesday 20 July 2004 05:03 pm, Henry House wrote:
...
> A subquery is an easy and fairly intuitive way to do this.
> 
> 	SELECT * from (
> 		SELECT SSN from [Fall 2003]
> 		UNION
> 		SELECT SSN from [Spring 2004]
> 	) WHERE race = 1;

Or to just get the headcount, use "select count(*)" instead
of "select *".

...
> It would be helpful to know what RDBMS (PostgreSQL, MySQL, ...) you are
> using since they vary greatly in their SQL syntax and feature support.

What he said.  Personally I'm a big fan of PostgreSQL.

-- Rod