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Sum in MySQL (IF ())

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Author: User
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A friend of mine suddenly sent me a SQL statement and asked me all at once.

I think this kind of grammatical wood has been seen. I checked, only to understand what the meaning of the original is the use of MySQL inside.

SUM (IF (' hosts ') (state = 0, 1, 0)) as Hostnomal, this statement, when the value of Hosts.state is 0 o'clock, and plus 1, not 0 o'clock, and plus 0. Similar to the three-dimensional expression in a program.

Sum in MySQL (IF ())

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