The Postgres query language is a variant of the SQL3 draft next-generation standard. It has many extensions such as an extensible type system, inheritance, functions and production rules. These are features carried over from the original Postgres query language, PostQuel. This section provides an overview of how to use Postgres SQL to perform simple operations. This manual is only intended to give you an idea of our flavor of SQL and is in no way a complete tutorial on SQL. Numerous books have been written on SQL, including [MELT93] and [DATE97]. You should be aware that some language features are not part of the ANSI standard.
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