Originally posted by richard-af
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SQL Help please
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Originally posted by DimPrawn View PostSP, if anyone else disagrees with me, can you please ban them?
sure thing dp. us amateurs need to stick together.Comment
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Originally posted by DimPrawn View PostDon't need to. 9 times out of 10 a join on two columns with appropriate indexes will generate a better execution plan than using IN, which ends up using a hash/match algorithm.McCoy: "Medical men are trained in logic."
Spock: "Trained? Judging from you, I would have guessed it was trial and error."Comment
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Originally posted by lilelvis2000 View PostPossibly. depends if the indexes are used or not. Exists might work better. Who knows? Only can tell when you see the execution plan. For inner joins I agree the indexes will speed things along, I'm not certain a left outer join where the right side is filtered to be empty will be faster than a Exists. Then, if he's using mySQL the Left join AFAIK does something unlike a left outer join.Comment
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chaps,
Performance isn't a problem unless it's a problem.
anyway, I quite fancy
SELECT customerid FROM customer
MINUS
SELECT customerid FROM order;Comment
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Originally posted by thunderlizard View Postchaps,
Performance isn't a problem unless it's a problem.
anyway, I quite fancy
SELECT customerid FROM customer
MINUS
SELECT customerid FROM order;
That SQL: Hmmm... 2 potentially big sets of data operated on, battering the DB nicely. Where do you work? I could make a killing, even if I just stopped the lights dimming every time you run your lovely SQL!Comment
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potentially big
you're inventing your own nonfunctional requirements there.
When you go down the shops, do you always drive a 54-seater coach because you could "potentially" meet 53 mates wanting a lift along the way?Comment
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Originally posted by thunderlizard View Postyou're inventing your own nonfunctional requirements there.
When you go down the shops, do you always drive a 54-seater coach because you could "potentially" meet 53 mates wanting a lift along the way?Comment
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Couldn't you just ring up all the customers and ask them if they have any orders? FFS, kids of today....Comment
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