在MySQL上结合INSERT INTO和SELECT

Question

步骤1）在 users 表中找到player表中不存在的 id 。 步骤2）将缺少的 id s

插入到玩家表中

所以我应该结合这两个查询。 （将SELECT查询的结果作为列表提供给INSERT INTO查询）

SELECT users.uid 
FROM users 
WHERE users.uid NOT IN (select uid from players);

INSERT INTO players (uid)
VALUES ()

最干净的方法是什么？

Answer 1

将您的选择查询放在插入查询下方，然后移除values()：

INSERT INTO players (uid)
SELECT users.uid 
FROM users 
WHERE users.uid NOT IN (select uid from players);  

基于评论的编辑
一种简单的方法是使用INSERT IGNORE - 这基本上会插入不在uid表中的所有players而忽略其余的：

INSERT IGNORE INTO players (uid)
SELECT users.uid 
FROM users

Answer 2

INSERT INTO players 
SELECT users.uid 
FROM users 
WHERE users.uid NOT IN (select uid from players);

Answer 3

试试这个：

INSERT INTO users (uid)
(SELECT users.uid
   FROM users
   LEFT JOIN players ON users.uid = players.uid)
   WHERE players.uid IS null)