Question

For the following statement:

INSERT INTO main_app_provider (provider) 
VALUES ((SELECT distinct(provider) FROM raw_financials));

I get a "subquery returns more than one row".

It seems the above is trying to do an INSERT into a single row. How would I load this into a table for multiple rows (i.e., so each provider is inserted into a new row)?

Answer 1

Remove the VALUES keyword. The parentheses around the SELECT are not strictly needed either.

INSERT INTO main_app_provider (provider) SELECT distinct provider FROM raw_financials;

See the MySQL INSERT syntax reference for full details.