Peformance of IN vs. OR

1	From a performance perspective what is the better approach for huge tables: using OR or using IN like in select * from table where a = 1 or a = 2; vs. select * from table where a in (1,2) performance optimizer sql asked 30 Oct '12, 07:15 Martin 8.8k●126●163●250 accept rate: 14% flat view

2 Answers:

AFAIK, they are semantically equivalent and should be rewritten in the same way.

Cf. page 10 from this excellent whitepaper by Ani:

permanent link

answered 30 Oct '12, 07:25

Volker Barth
39.3k●355●539●809
accept rate: 33%

I thought so too (equivalent) anyway in real world I see totally different plans which are used...

Thanks for the link, I wasn't aware of this paper!

(30 Oct '12, 07:28) Martin

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Well, I'd just noticed it today and really like to share that link:)

(30 Oct '12, 07:47) Volker Barth

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-2	Can't say for sure in SQL Anywhere database, but you can check this link for a general behavior. permanent link answered 01 Nov '12, 07:47 Gandalf 199●5●7●16 accept rate: 50% flat view

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question asked: 30 Oct '12, 07:15

question was seen: 1,987 times

last updated: 01 Nov '12, 07:47

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