On Wed, 3 Nov 2004, Chaitra Yale wrote:
> ...how can union be the same as intersect..iam trying to get the names
> of comapnies that are in both queries.....for example the first query
> gives me companies A, B AND C and the second query gives A , B..i want
> the intersect of these 2 queries....so i get companies A and B...if i
> did a union i will get A, B and C
Could use the union in a subquery together with a HAVING COUNT(*) on the
outside.
SELECT * FROM (
SELECT DISTINCT col1 FROM t1 WHERE...
UNION ALL
SELECT DISTINCT col1 FROM t1 WHERE...
) AS tbl
GROUP BY tbl.col1 HAVING COUNT(*) = 2
Or something... not sure how well that would performe, however.
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