Strange SQL Features
Strange means: I don't know much about them.
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https://www.postgresql.org/docs/9.5/static/sql-createcollation.html -
https://www.postgresql.org/docs/9.5/static/sql-createconversion.html -
https://www.postgresql.org/docs/9.5/static/sql-createeventtrigger.html -
https://www.postgresql.org/docs/9.5/static/sql-createopclass.html -
https://www.postgresql.org/docs/9.5/static/sql-createopfamily.html -
https://www.postgresql.org/docs/9.5/static/sql-createserver.html -
https://www.postgresql.org/docs/9.5/static/sql-createtransform.html -
https://www.postgresql.org/docs/9.5/static/sql-createusermapping.html