Re: [GENERAL] CREATE TABLE ... CONSTRAINT

Hello Dario,

lunedì, 17 agosto 98, you wrote:


DB> Hi all

DB>   I have been using postgreSQL for a while now and it is doing the job
DB> I want it to.  Thank you to all pgsql-hackers for their good job.

DB>   I        am   running    a       vanilla 6.3.2     installed    from
DB> postgresql-{,clients-,devel-,data-}6.3.2-4.rpm.   Some of the problems
DB> of taht distribution  stem  from the   rpm specfile  (for instance,  a
DB> world-writable  and world-readable pg_pwd !!)  and are not interesting
DB> for this list.

DB>   However, there is one thing which I find annoying:

testdata=>> CREATE TABLE test ( number int check ( number > 3 ) );

DB> works fine, but the table is dumped with a different syntax:

DB> CREATE TABLE test (number int4) CONSTRAINT test_number CHECK number > 3;

DB> which is not accepted back:

testdata=>> CREATE TABLE test (number int4) CONSTRAINT test_number CHECK number > 3;
DB> ERROR:  parser: parse error at or near "constraint"

DB>   Now, the  second  syntax  is standard  SQL   and the  parser  should
DB> recognize  it, but in  any case at least  pg_dump compliance should be
DB> aimed at.

DB> Bye
DB> Dario

DB> --
DB> ######################################################################
DB> # Dario Besseghini, system manager,
DB> #                  Department of  Computer Science, University of Pisa
DB> # http://www.di.unipi.it/~besseghi

Ciao Dario,

Seems that your syntax (CREATE TABLE test (number int4) CONSTRAINT
test_number CHECK number > 3;)
isn't SQL standard.

-----------------------
There are two kinds of Integrity CONSTRAINTs;
    - the Column constraint:
      CREATE TABLE test ( number int check ( number > 3 ) );
and
    - the Table constraint:
      CREATE TABLE test ( number int4 CONSTRAINT test_number CHECK (number > 3));

This one has the right syntax and it works.

Best regards,
  Jose'                            mailto:sferac@bo.nettuno.it