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Postgresql insert if not exists


Don't put the columns in parentheses.

If you look at the full error message you get, then Postgres actually tells you what was wrong.

ERROR: INSERT has more target columns than expressions
Hint: The insertion source is a row expression containing the same number of columns expected by the INSERT. Did you accidentally use extra parentheses?

The expression ('Wow', 'wow') is just a single column, an anonymous "record" with two variables (See the manual for details)

INSERT INTO tags (name, slug)
SELECT 'Wow', 'wow'
WHERE NOT EXISTS (SELECT id FROM tags WHERE slug =
'wow')
RETURNING id;

In general it's a good idea to add parentheses only if they are really required


Categories : SQL

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