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The SQL standard says that redundant unique constraints are disallowed, but we long ago decided that throwing an error would be too user-unfriendly, so we just drop redundant ones. The docs weren't very clear about that though, as this behavior was only explained for PRIMARY KEY vs UNIQUE, not UNIQUE vs UNIQUE. While here, I couldn't resist doing some copy-editing and markup-fixing on the adjacent text about INCLUDE options. Per bug #16767 from Matthias vd Meent. Discussion: https://postgr.es/m/16767-1714a2056ca516d0@postgresql.org |
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