COUNT on UNION Result - SQL Server Forums

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COUNT on UNION Result

Author

Topic

geossl
Yak Posting Veteran

85 Posts

Posted - 2003-12-01 : 22:24:25

Dear all,
Is it possible to use one query to count the result of the following UNION?

SELECT DocID
FROM TblA
WHERE ID = 8000

UNION

SELECT DocID
FROM TblB
WHERE Type = 'B'

Thanks.

byrmol
Shed Building SQL Farmer

1591 Posts

Posted - 2003-12-01 : 22:33:15

[code]
SELECT COUNT(*)
FROM
(
SELECT DocID
FROM TblA
WHERE ID = 8000

UNION

SELECT DocID
FROM TblB
WHERE Type = 'B'
) AS A
[/code]

By the way, UNION does a DISTINCT while UNION ALL does not.

DavidM

"SQL-3 is an abomination.."

SamC
White Water Yakist

3467 Posts

Posted - 2003-12-01 : 23:08:09

If the count is all that's needed

SELECT (SELECT COUNT(DISTINCT DocID) FROM TblA WHERE ID = 8000) + (SELECT COUNT(DISTINCT DocID) FROM TblB WHERE Type = 'B')

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