On 3/1/26 5:38 PM, Igor Korot wrote:
> Hi, ALL,
> I'm looking at https://www.postgresql.org/docs/current/sql-createtable.html
> and see some weird stuff.
>
> When I try to search for "PRIMARY KEY" I eventually hit following:
>
> [quote]
> PRIMARY KEY (column constraint)
> PRIMARY KEY ( column_name [, ... ] [, column_name WITHOUT OVERLAPS ] )
> [ INCLUDE ( column_name [, ...]) ] (table constraint)
> [/quote]
What the above is telling you is that PK can be defined as part of the
column definition:
some_fld some_type PRIMARY KEY
or as part of the overall table definition:
CREATE TABLE
...
some_fld some_type,
other_fld other_type'
...
PRIMARY KEY (some_fld, other_fld);
Look at the top of documentation under:
"where column_constraint is:"
and
"and table_constraint is:"
respectively.
>
> And so according to the documentation one can write:
>
> CREATE TABLE foo( id SERIAL PRIMARY KEY PRIMARY KEY, ... );
>
> which unfortunately will be illegal.
>
> Or not?
>
> Thank you.
>
>
--
Adrian Klaver
adrian.klaver@aklaver.com
