PostgreSQL database - only insert if the record doesn't exist

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Cannot SELECT from UPDATE RETURNING clause in postgres

I am using a PostgreSQL database which has a "company" table and a "country" table which each have a uniqueID.

I want a setup where if I try to add a company to the database, it only adds the company to the database with a new unique ID if it doesn't already exist.

this has already been asked/solved – Woot4Moo Dec 16 '12 at 14:50 — Woot4Moo, Dec 16 '12 at 14:50

score 7 · Accepted Answer · edited May 23 '17 at 12:19

7

insert into company (unique_id, company_name)
select 42, 'New Company Name'
from company
where not exists (select 1 from company where unique_id = 42);

See also here for a more general solution: Insert, on duplicate update in PostgreSQL?

edited May 23 '17 at 12:19

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answered Dec 16 '12 at 14:47

a_horse_with_no_name

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PostgreSQL database - only insert if the record doesn't exist

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