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aggregate only get when >0

Posted on 2014-09-15
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Last Modified: 2014-09-15
Hello,
How do I only to get records that have Cnt>0 in

SELECT MyTableId, Cnt=(SELECT COUNT(*) FROM OtherTable o where o.MyTableId=m.MyTableId)
 FROM MyTable m
0
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Question by:johnson1
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3 Comments
 
LVL 66

Assisted Solution

by:Jim Horn
Jim Horn earned 250 total points
ID: 40323083
SELECT m.*
FROM MyTable m
    JOIN (SELECT MyTableID, count(some_column) as the_count FROM OtherTable GROUP BY MyTableID) o ON m.MyTableId = o.MyTableId
GROUP BY MyTableId
ORDER BY MyTableId
HAVING o.the_count > 0    -- <--   Looky here

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I have an article called SQL Server GROUP BY Solutions that talks a lot about the HAVING clause.  If you like what you see, please click the 'Yes' button next to 'Was this article helpful?', and provide some feedback.

Thanks in advance.
Jim
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LVL 15

Accepted Solution

by:
Vikas Garg earned 250 total points
ID: 40323097
Hi,
You can achieve your result this way
;With CTE as
(
SELECT MyTableId, Cnt=(SELECT COUNT(*) FROM OtherTable o where o.MyTableId=m.MyTableId)
 FROM MyTable
)

SELECT * FROM CTE WHERE CNT > 0

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LVL 49

Expert Comment

by:PortletPaul
ID: 40323144
I'm not sure if it is deliberate or not but you have omitted GROUP BY in your question; but you refer to getting recordS (plural) so I assume a group by being used.

SELECT o.MyTableId, COUNT(*)  as cnt
FROM OtherTable o
GROUP BY o.MyTableId
HAVING COUNT(*)  > 0

Use a HAVING clause which allows you to filter the aggregated values, here it will remove all counts of zero from the result.
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