On Dom 29 Abr 2001 22:34, LeoDeBeo wrote:
> 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.
My docs (7.1) look like this:
CREATE [ TEMPORARY | TEMP ] TABLE table_name ( { column_name type [ column_constraint [ ... ] ] |
table_constraint} [, ... ] ) [ INHERITS ( inherited_table [, ... ] ) ]
where column_constraint can be:
[ CONSTRAINT constraint_name ]
{ NOT NULL | NULL | UNIQUE | PRIMARY KEY | DEFAULT value | CHECK (condition) | REFERENCES table [ ( column ) ] [ MATCH
FULL| MATCH PARTIAL ] [ ON DELETE action ] [ ON UPDATE action ] [ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED
|INITIALLY IMMEDIATE
]
}
and table_constraint can be:
[ CONSTRAINT constraint_name ]
{ UNIQUE ( column_name [, ... ] ) | PRIMARY KEY ( column_name [, ... ] ) | CHECK ( condition ) | FOREIGN KEY (
column_name[, ... ] ) REFERENCES table [ ( column [, ... ] )
] [ MATCH FULL | MATCH PARTIAL ] [ ON DELETE action ] [ ON UPDATE action ] [ DEFERRABLE | NOT DEFERRABLE ] [
INITIALLYDEFERRED | INITIALLY IMMEDIATE
]
}
Looks clear to me. :-)
--
El mejor sistema operativo es aquel que te da de comer.
Cuida tu dieta.
-----------------------------------------------------------------
Martin Marques | mmarques@unl.edu.ar
Programador, Administrador | Centro de Telematica Universidad Nacional
del Litoral
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