Обсуждение: A problem about alter table

Hi, all
I'm using postgreSQL 7.2.3. The following statement always cuases a parser
error, "parse error at or near NOT". Please adivse, thank you in advance.

ALTER TABLE _acct_group1   ALTER groupkey  SET NOT NULL;

Jack

jack wrote:

> Hi, all
> I'm using postgreSQL 7.2.3. The following statement always cuases a parser
> error, "parse error at or near NOT". Please adivse, thank you in advance.
>
> ALTER TABLE _acct_group1
>     ALTER groupkey  SET NOT NULL;
>
> Jack
>From Postgres 7.2 documentation:

"In the current implementation of ADD COLUMN, default and NOT NULL 
clauses for the new column are not supported. You can use the SET 
DEFAULT form of ALTER TABLE to set the default later. (You may also want 
to update the already existing rows to the new default value, using 
UPDATE.)"

There is nothing about setting not null fields.
I think you have to create trigger instead of altering table.

Regards,
Tomasz Myrta

But on postgreSQL 7.2 reference manual, there is a statement for alter table
such as, ALTER TABLE [ ONLY ] table [ * ]   ALTER [ COLUMN ] column { SET | DROP } NOT NULL

Do you mean  this one hasn't been implemented?

Jack

----- Original Message -----
From: "Tomasz Myrta" <jasiek@klaster.net>
To: "jack" <datactrl@tpg.com.au>
Cc: <pgsql-sql@postgresql.org>
Sent: Tuesday, January 07, 2003 11:31 PM
Subject: Re: [SQL] A problem about alter table


> jack wrote:
>
> > Hi, all
> > I'm using postgreSQL 7.2.3. The following statement always cuases a
parser
> > error, "parse error at or near NOT". Please adivse, thank you in
advance.
> >
> > ALTER TABLE _acct_group1
> >     ALTER groupkey  SET NOT NULL;
> >
> > Jack
> >
>  From Postgres 7.2 documentation:
>
> "In the current implementation of ADD COLUMN, default and NOT NULL
> clauses for the new column are not supported. You can use the SET
> DEFAULT form of ALTER TABLE to set the default later. (You may also want
> to update the already existing rows to the new default value, using
> UPDATE.)"
>
> There is nothing about setting not null fields.
> I think you have to create trigger instead of altering table.
>
> Regards,
> Tomasz Myrta
>

jack wrote:

> But on postgreSQL 7.2 reference manual, there is a statement for alter 
> table
> such as, ALTER TABLE [ ONLY ] table [ * ]
>     ALTER [ COLUMN ] column { SET | DROP } NOT NULL
>
> Do you mean  this one hasn't been implemented?
>
> Jack
>
Strange. I don't have such ALTER TABLE in my 7.2 documentation. There is 
only ALTER... SET | DROP DEFAULT.

Tomasz

On Wed, 8 Jan 2003, jack wrote:

> But on postgreSQL 7.2 reference manual, there is a statement for alter table
> such as, ALTER TABLE [ ONLY ] table [ * ]
>     ALTER [ COLUMN ] column { SET | DROP } NOT NULL
>
> Do you mean  this one hasn't been implemented?
>
> Jack

This syntax is valid in 7.3 (not 7.2)

>
> ----- Original Message -----
> From: "Tomasz Myrta" <jasiek@klaster.net>
> To: "jack" <datactrl@tpg.com.au>
> Cc: <pgsql-sql@postgresql.org>
> Sent: Tuesday, January 07, 2003 11:31 PM
> Subject: Re: [SQL] A problem about alter table
>
>
> > jack wrote:
> >
> > > Hi, all
> > > I'm using postgreSQL 7.2.3. The following statement always cuases a
> parser
> > > error, "parse error at or near NOT". Please adivse, thank you in
> advance.
> > >
> > > ALTER TABLE _acct_group1
> > >     ALTER groupkey  SET NOT NULL;
> > >
> > > Jack
> > >
> >  From Postgres 7.2 documentation:
> >
> > "In the current implementation of ADD COLUMN, default and NOT NULL
> > clauses for the new column are not supported. You can use the SET
> > DEFAULT form of ALTER TABLE to set the default later. (You may also want
> > to update the already existing rows to the new default value, using
> > UPDATE.)"
> >
> > There is nothing about setting not null fields.
> > I think you have to create trigger instead of altering table.
> >
> > Regards,
> > Tomasz Myrta
> >
>
>
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email:  achill@matrix.gatewaynet.com       mantzios@softlab.ece.ntua.gr

--- jack <datactrl@tpg.com.au> wrote:
> Hi, all
> I'm using postgreSQL 7.2.3. The following statement
> always cuases a parser
> error, "parse error at or near NOT". Please adivse,
> thank you in advance.
> 
> ALTER TABLE _acct_group1
>     ALTER groupkey  SET NOT NULL;
I believe you will need to use:

ALTER TABLE _acct_group1 ADD CONSTRAINT <constraint
name> CHECK groupkey NOT NULL;

I haven't checked that syntax for correctness, but
it's covered in the docs on ALTER TABLE.

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