On Fri, Mar 28, 2014 at 12:45 PM, hari.fu...@gmail.com wrote:
I want to ensure that for any given value of fk_col that there is a
maximum
of one row with bool_col = true.
This should be what you want:
ALTER TABLE exclusion_example
ADD CONSTRAINT ex
EXCLUDE (fk_col WITH =) WHERE
Moshe Jacobson mo...@neadwerx.com writes:
Take the following table:
CREATE TABLE exclusion_example AS
(
pk_col integer primary key,
fk_col integer not null references other_table,
bool_col boolean not null
);
I want to ensure that for any given value of fk_col that there
On Fri, Mar 28, 2014 at 12:21 PM, Igor Neyman iney...@perceptron.comwrote:
For this:
any given value of fk_col that there is a maximum of one row with
bool_col = true.
why don't you (instead) create partial unique index:
CREATE UNIQUE INDEX on exclusion_example(fk_col, bool_col) WHERE
Take the following table:
CREATE TABLE exclusion_example AS
(
pk_col integer primary key,
fk_col integer not null references other_table,
bool_col boolean not null
);
I want to ensure that for any given value of fk_col that there is a maximum
of one row with bool_col = true. I
From: pgsql-general-ow...@postgresql.org
[mailto:pgsql-general-ow...@postgresql.org] On Behalf Of Moshe Jacobson
Sent: Friday, March 28, 2014 10:31 AM
To: pgsql-general
Subject: [GENERAL] Help with exclusion constraint
Take the following table:
CREATE TABLE exclusion_example AS
(
pk_col
