Aug
6
For the uninitiated, a derived table is where you create a query that contains another query but that second query is wrapped in parenthesis and you will normally join to it for further results or set operations.
The pseudo-code is like:
Select a.Blah, b.BlahBlah From FirstTable a Join (select BlahBlah from SecondTable ) b On b.ID = a.ID
So the second query becomes the “derived table”, all in memory, and is joinable just like a regular table, and all of its indexes are play as well.
BUT - do derived tables have performance better or worse than temp tables and in memory temp table variables?
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Fernando Torres’ lack of form at Chelsea has finally cost him a place in the Spain squad, this despite his having scored 27 goals in 91 inte rnational appearances. The former Liverpool man makes way for Valencia’s Roberto Soldado, who has 20 goals to his name in all competitions this seas on .