從子查詢返回多行？

Question

我應該在這裏分組嗎？我想返回在第一where子句中的每個關係的所有行，但我想要行按車站（station_id）分組

最好的辦法做到這一點？ - 我已經嘗試過下面的查詢，但它不允許在where子句中返回多行子查詢

SELECT 
    posts.dated, user_data.user_id , user_data.delegate_no, user_data.first_name, user_data.surname, user_data.company_name, user_data.tel_no, user_data.email_addr, user_data.rfid_tag 
FROM 
    user_data, posts 
WHERE 
    posts.station_id = 
     (SELECT station_id FROM upd8r_stations WHERE owner_id = '12') 
    AND 
     user_data.user_id = posts.user_id 
ORDER BY posts.dated DESC; 

Answer 1

使用IN？

WHERE 
    posts.station_id IN 
     (SELECT station_id FROM upd8r_stations WHERE owner_id = '12')