I have 3 tables. I want to remove rows from table A that have a value in a DateEntered field before a specific date but have no history records after that date in table B or C. I have this select statement with inner join that returns only the rows in a that have a matching row in B or C prior to the date I want to remove:
SELECT * FROM MyTableA a
JOIN
(SELECT Firstname, Lastname, RegionID, MAX(DateEntered) AS MaxB FROM MyHistoryB
GROUP BY Lastname, Firstname,RegionID HAVING MAX(DateEntered) < '8/18/2006') b
ON a.firstname = b.firstname AND a.lastname = b.lastname
AND a.RegionID = b.RegionID
JOIN
(SELECT p_Firstname, p_Lastname, RegionID, MAX(DateEntered)AS MaxC FROM MyHistoryC
GROUP BY p_Lastname, P_Firstname, RegionID HAVING MAX(DateEntered)< '8/18/2006') c
ON a.firstname =c.p_firstname AND a.lastname =c.p_lastname
AND a.RegionID = c.RegionID
I need to turn that around completely. What I need is something that selects rows with DateEntered in A of < 8/18/2006 and no rows in B or C with DateEntered > 8/18/2006 joining on the three fields mentioned above.
Thanks!
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BrandonGalderisi,
I don't believe that this is returning exactly what I am looking for. I want to delete rows more than 2 years old as long as there is not a record in B or C within the 2 years.
Perhaps include in the join condtion for both A and B
AND dateEntered >= '8/18/2006' ?
and the where clause:
where (b.FirstName is NULL or c.P_FirstName is null) AND g.dateentered < '8/18/2006' ?
Ok... I read "DateEntered in A of < 8/18/2006 and no rows in B or C with DateEntered > 8/18/2006" and interpreted "DateEntered in A of < 8/18/2006 and no rows in B" or "C with DateEntered > 8/18/2006". You did say "C with dateEntered > 8/18/2006".
Now if you want to delete from A if there are NO MATCHING RECORDS IN EITHER TABLE.... this should do it.
This is exactly why I always write a delete as a select here first.
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by: BrandonGalderisiPosted on 2008-08-19 at 08:08:00ID: 22260469
The below will select A records to be deleted.
Remove the two -- to test your delete to make sure the record counts match up.
Run with a commit at the end instead of the rollback to do the delete.
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