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Re: what is the difference between index (a,b) and (b,a)
Posted by: Bing Wu
Date: March 06, 2017 04:23AM

Sorry, there is a mistake.
I mean placing the field with bigger cardinality at first, the index can be used for both "where a = x and b = y" and "where a = y"(say the cardinality of a is bigger than b)

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Re: what is the difference between index (a,b) and (b,a)
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March 06, 2017 04:23AM


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