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#1
June 7th, 2004, 02:13 PM
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Query - looking for efficiency
Here is a query used for DB2 (AS/400) where I am trying to retreive an account that has the newest effective date (EffDate) and within that, the highest endorsement number (EndsNum):
Code:
Select Account, EffDate, EndsNum, Name From TABLE_A Where Account = '123456789' AND EffDate = (Select Max(EffDate) from TABLE_A where Account = '123456789') AND EndsNum = (Select Max(EndsNum) from TABLE_A where account = '123456789' AND EffDate = (Select Max(EffDate) from TABLE_A where Account = '123456789')) Works, but this seems like the wrong way to go about this...any suggestions for improving the query?
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#2
June 7th, 2004, 09:53 PM
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Instead of using subqueries, would ordering the records in the correct order and just selecting a single record work? Something like:
SELECT Account, EffDate, EndsNum, Name FROM TABLE_A WHERE Account = '123456789' ORDER BY EffDate DESC, EndsNum DESC FETCH FIRST 1 ROWS ONLY A query like this should have the maximum EffDate as the first record and the maximum EndsNum associated with that date.
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