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doc(faq): fix wording for empty cases

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Austin Bonander 2021-07-16 13:03:50 -07:00 committed by GitHub
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@ -35,10 +35,10 @@ Note that you can use any operator that returns a boolean, but beware that `!= A
The equivalent of `NOT IN (...)` would be `!= ALL($1)`:
`lhs != ALL(rhs) -> lhs != rhs[0] AND lhs != rhs[1] AND ... lhs != rhs[length(rhs) - 1]`
`lhs != ALL(rhs) -> true AND lhs != rhs[0] AND lhs != rhs[1] AND ... lhs != rhs[length(rhs) - 1]`
Note that `ANY` with any operator with an empty array will return `false`, thus the leading `false OR ...`,
while `ALL` with an empty array will return `true`, thus the leading `true AND ...`.
Note that `ANY` using any operator and passed an empty array will return `false`, thus the leading `false OR ...`.
Meanwhile, `ALL` with any operator and passed an empty array will return `true`, thus the leading `true AND ...`.
See also: [Postgres Manual, Section 9.24: Row and Array Comparisons](https://www.postgresql.org/docs/current/functions-comparisons.html)