12th September 2019: PostgreSQL 12 Beta 4 Released!
Unsupported versions: 7.0
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A comment is an arbitrary sequence of characters beginning with double dashes and extending to the end of the line, e.g.:

-- This is a standard SQL comment
We also support C-style block comments, e.g.:
/* multi
A comment beginning with "/*" extends to the first occurrence of "*/".