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This is the best answer in my opinion. However, be careful with the rank() function in situations where there are ties. You could end up with more than one rank=1. Better to use row_number() if you really do want just one record returned.

cartbeforehorse
– cartbeforehorse

2012-05-26 13:18:16 +00:00
Commented May 26, 2012 at 13:18
3

Also, be aware that the QUALIFY clause is specific to Teradata. In Oracle (at least) you have to nest your query and filter using a WHERE clause on the wrapping select statement (which probably hits performance a touch, I'd imagine).

cartbeforehorse
– cartbeforehorse

2012-05-26 13:40:06 +00:00
Commented May 26, 2012 at 13:40

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