create table

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От LeoDeBeo
Тема create table
Дата
Msg-id 9chq93$21vm$1@news.tht.net
обсуждение исходный текст
Ответы Re: create table  (Roberto Mello <rmello@cc.usu.edu>)
Список pgsql-docs
can anybody explain me the syntax of Create Table documentation??

CREATE [ TEMPORARY | TEMP ] TABLE table (
        column type
        [ NULL | NOT NULL ] [ UNIQUE ] [ DEFAULT value ]
        [ column_constraint_clause | PRIMARY KEY } [ ... ] ]
        [ , ... ]
        [ , PRIMARY  KEY ( column [, ... ] ) ]
        [ , CHECK (condition) ]
        [ , table_constraint_clause ]
        ) [ INHERITS ( inherited_table [, ... ] ) ]

i don't understand what the curly brace means after PRIMARY KEY (where is
the other matching brace? ). It must have something to do with the fact
that a 'column type' pair ( with options ) can occur more than once, but is
this syntax right?
i also don't understand what the [ ... ] and [, ... ] means. I do know that
brackets denote options and | alternatives.

tx

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