1
vote
1answer
626 views

Duplicate key violates unique constraint

When I use this query everything is fine: UPDATE users SET f_name='Mike', l_name='MyLastName', username='blabla', "password"='asdfsdaf', "class"=12, ...
4
votes
2answers
325 views

Custom unique column constraint, only enforced if one column has a specific value

Is it possible to have a custom unique column constraint as follows? Suppose I have two cols, subset and type, both strings (though the data types probably doesn't matter). If type is "true", then ...
8
votes
1answer
8k views

Optimal way to ignore duplicate inserts?

Background This problem relates to ignoring duplicate inserts using PostgreSQL 9.2 or greater. The reason I ask is because of this code: -- Ignores duplicates. INSERT INTO db_table ...
1
vote
1answer
2k views

PostgreSQL duplicate key violates unique constraint error

CentOS 6.2 64bit Server PostgreSQL 8.4.9 installed via yum I am seeing errors from time to time in PostgreSQL's logs about a table called events. The events table is used to stores information ...
4
votes
2answers
247 views

What happens to the index of a primary key after a DROP CONSTRAINT?

I am running PostgreSQL 9.1.4. I have a table with many existing rows, and a bunch of other tables with foreign keys pointing to it, for which I am trying to : 1 - Remove the pkey constraint on the ...
13
votes
3answers
7k views

PostgreSQL multi-column unique constraint and NULL values

I have a table like the following: create table my_table ( id int8 not null, id_A int8 not null, id_B int8 not null, id_C int8 null, constraint pk_my_table primary key (id), constraint ...