Question

I have a table where one column has duplicate records but other columns are distinct. so something like this

Code SubCode version status

1234 D1 1 A

1234 D1 0 P

1234 DA 1 A

1234 DB 1 P

5678 BB 1 A

5678 BB 0 P

5678 BP 1 A

5678 BJ 1 A

0987 HH 1 A

So in the above table. subcode and Version are unique values whereas Code is repeated. I want to transfer records from the above table into a temporary table. Only records I would like to transfer are where ALL the subcodes for a code have status of ‘A’ and I want them in the temp table only once.

So from example above. the temporary table should only have 5678 and 0987 since all the subcodes relative to 5678 have status of ‘A’ and all subcodes for 0987 (it only has one) have status of A. 1234 is ommited because its subcode ‘DB’ has status of ‘P’

I’d appreciate any help!

Answer 1

INSERT theTempTable (Code) SELECT t.Code FROM   theTable t        LEFT OUTER JOIN theTable subT ON (t.Code = subT.Code AND subT.status <> 'A') WHERE  subT.Code IS NULL GROUP BY t.Code 

This should do the trick. The logic is a little tricky, but I’ll do my best to explain how it is derived.

The outer join combined with the IS NULL check allows you to search for the absence of a criteria. Combine that with the inverse of what you’re normally looking for (in this case status = ‘A’) and the query succeeds when there are no rows that do not match. This is the same as ((there are no rows) OR (all rows match)). Since we know that there are rows due to the other query on the table, all rows must match.