将数据从一个表复制到另一张PostgreSQL

Question

So I have one table with duplicates of data and I only want to copy the distinct rows into the new table and also give the new table primary key id. This is what I have so far but it doesn't seem to do what I want it to.

INSERT INTO m_new
SELECT * FROM m
WHERE EXISTS (
    SELECT DISTINCT address, city, zip FROM m
)

Answer 1

I'm pretty sure you want distinct on :

INSERT INTO m_new
    SELECT DISTINCT ON (address, city, zip) m.*
    FROM m
    ORDER BY address, city, zip;

DISTINCT ON returns one row for each group of keys.