Re: REFERENCE problem with parent_table

Richard Broersma Jr wrote:
>> I need many tables of type "id" and "name", see below:
>> /      CREATE TABLE id_names (
>>       id            smallint        CONSTRAINT the_id PRIMARY KEY NOT NULL,
>>       name        text            CONSTRAINT the_name UNIQUE
>>     ) WITH OIDS;/
>> therefore I created these tables with the "LIKE" operator, see below:
>> /    CREATE TABLE like_id_1( LIKE id_names INCLUDING DEFAULTS ) WITH OIDS;
>>     CREATE TABLE like_id_2 ( LIKE id_names INCLUDING DEFAULTS ) WITH OIDS;
>>
>
> it looks like the syntax here is a little off from what is defined by:
> http://www.postgresql.org/docs/8.1/interactive/sql-createtable.html
>
> CREATE TABLE like_id_1 ( id    smallint like id_names,
>                          name  text     like id_name ) with oids ;
>
Are you sure, I think that you are wrong.  Operator "LIKE" is like a
operator for a "table_constraint", I mean, is wrote in a new line, like
a new column, and isn't property or part of any column.  More over, in
the documentation is wrote: "/The LIKE clause specifies a table from
which the new table automatically copies all column names, their data
types, and their not-null constraints./", but is like  the operator
"REFERENCE" see the tables "like_id_1" empty (see below) or maybe is a
bug in posgresql.
/    database=# insert into like_id_1 values (1,'hello');
    INSERT 157581 1
    database=# select * from like_id_1;
     id | name
    ----+--------
      1 | hello
    (1 row)
    database=# CREATE TABLE ref_1 ( id smallint CONSTRAINT the_id
REFERENCES like_id_1 (id) );
    ERROR:  there is no unique constraint matching given keys for
referenced table "like_id_1"/

  Thank you any way,
        Gustavo