What happens with duplicates when inserting multiple rows?

Question

I am running a python script that inserts a large amount of data into a Postgres database, I use a single query to perform multiple row inserts:

INSERT INTO          


        

Answer 1

Will it stop the entire query and throw an exception? Yes.

To avoid that, you can look on the following SO question here, which describes how to avoid Postgres from throwing an error for multiple inserts when some of the inserted keys already exist on the DB.

You should basically do this:

INSERT INTO DBtable
        (id, field1)
    SELECT 1, 'value'
    WHERE
        NOT EXISTS (
            SELECT id FROM DBtable WHERE id = 1
);