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CREATE TABLE publisher( id serial PRIMARY KEY , name text NOT NULL); CREATE TABLE product( id serial NOT NULL , name text NOT NULL , publisherref int NOT NULL REFERENCES publisher(id)); INSERT INTO publisher (id,name) VALUES (1,'pub1') , (2,'pub2') , (3,'pub3'); INSERT INTO product (name,publisherref) VALUES ('p1',1) , ('p2',2) , ('p3',2) , ('p4',2) , ('p5',3) , ('p6',3);
3 rows affected
6 rows affected
SELECT pub.name, pro.num_products FROM ( SELECT publisherref AS id, count(*) AS num_products FROM product GROUP BY 1 ) pro JOIN publisher pub USING (id) ORDER BY 2 DESC;
name
num_products
pub2
3
pub3
2
pub1
1