At 09:36 9/05/01 -0400, Bruce Momjian wrote:
>>
>> Is anybody planning to fix the problem with ALTER TABLE ADD CONSTRAINT...
>> in which the constraints are not applied to child tables?
>
>I thought we had not figured out how to inherit those, or at least
>certain constraints like UNIQUE. We do have on TODO:
>
> * Allow inherited tables to inherit index, UNIQUE constraint, and
> primary key [inheritance]
>
aaa=# create table t1(f1 integer check(f1<>0),primary key (f1));
aaa=# create table t1c() inherits (t1);
aaa=# \d t1c
Table "t1c"
Attribute | Type | Modifier
-----------+---------+----------
f1 | integer | not null
Constraint: (f1 <> 0)
So PK is not inherited, but CHECK (and implied NOT NULL) seem to be.
Whereas,
aaa=# create table t1(f1 integer);
aaa=# create table t1c() inherits (t1);
aaa=# alter table t1 add constraint aaa check(f1<>0);
aaa=# \d t1c
Table "t1c"
Attribute | Type | Modifier
-----------+---------+----------
f1 | integer |
ie. The CHECK constraints inherit only at the time of table creation. I
think this is a bug in ALTER TABLE for CHECK constraints.
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