mysql 數據庫join關聯查詢using(xxx)的做用

user表:mysql id | name --------- 1 | libk 2 | zyfon 3 | daodaosql user_action表:安全 user_id | action --------------- 1 | jump 1 | kick 1 | jump 2 | run 4 | swim測試 sql: select id, name, action from user a

>>阅读原文<<