Re: Sequential select queries...??

Mark,

> What i'd like to do is the following:
>
> Select id from T where name = 'bleh';
>
> and
>
> Select id from T where description = 'bleh';
>
> and result both results in the same result set. That is, duplicate
> id's
> if they appear. So then I could do a GROUP BY and a COUNT to see how
> many appeared in only one, and how many appeared in both.

What you want is UNION ALL. You also want to go out and purchase "SQL
for Smarties" after you finish reading my e-mail.

SELECT id FROM T WHERE name = 'bleh'
UNION ALL
SELECT id FROM T WHERE description = 'bleh';

This gives you both result sets, once right after the other. If you
didn't want to see duplicate values (i.e. only one instance of each
"id"), you would use simply UNION without the "ALL".

This means that it is possible to get both your desired rowcounts out of
a *single* query, using subselects. "SQL for Smarties" can help you
learn to build this kind of query.

-Josh

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