j-1064772 (1/13/2014)
You are right, I really meant INTERSECT only.EXCEPT was a mistake. (Also, [font="Courier New"]SELECT ProductID FROM Product WHERE NOT ProductID IN (SELECT ProductID FROM WorkOrder)[/font] also does yield the same results as EXCEPT).
Thanks for you suggested link.
Regards
I find it easier to read using EXCEPT. Also, using NOT IN will return an empty result set if the subquery contains a NULL.
Try these two and see what I mean.
SELECT ProductID
FROM Product
WHERE ProductID NOT IN
(
SELECT ProductID FROM WorkOrder
UNION ALL
SELECT NULL
)
SELECT ProductID
FROM Product
EXCEPT
(
SELECT ProductID FROM WorkOrder
UNION ALL
SELECT NULL
)
The differences are subtle but very important to understand.
_______________________________________________________________
Need help? Help us help you.
Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.
Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.
Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/