EXCLUDE constraint with not equals - Mailing list pgsql-general
Hello,
Given the following table, I would like to ensure that all the rows for an email that have a user defined map to the same user.
CREATE TABLE person (
id INTEGER PRIMARY KEY,
user TEXT,
email TEXT NOT NULL);
What I think I'm looking for is something like this:
CREATE TABLE person (
id INTEGER PRIMARY KEY,
user TEXT,
email TEXT NOT NULL,
EXCLUDE (email WITH =, user WITH <>)
WHERE (user IS NOT NULL));
EXCLUDE (email WITH =, user WITH <>)
WHERE (user IS NOT NULL));
The not equals comparison isn't supported, but it would be useful here.
Is there another way to do this, short of creating a separate table that associates email and user?
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