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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2019-09-23 12:37:04 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2019-09-23 12:37:04 -0400 |
| commit | 184b5fad00ace7009475221fcf12088e399f3249 (patch) | |
| tree | e8845156178138e91c292df9a8b7fcfdebabd7ff /src/tutorial/advanced.source | |
| parent | 6ddd164aaa344d2e9a1e3e62f69b6dcdfd329501 (diff) | |
Doc: clarify handling of duplicate elements in array containment tests.
The array <@ and @> operators do not worry about duplicates: if every
member of array X matches some element of array Y, then X is contained
in Y, even if several members of X get matched to the same Y member.
This was not explicitly stated in the docs though, so improve matters.
Discussion: https://postgr.es/m/156614120484.1310.310161642239149585@wrigleys.postgresql.org
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