将两个表中的主键不同数据查找出来并添加到一张新表中的sql示例

INSERT INTO t_user
SELECT
usera.userid,
usera.name,
usera.department,
usera.position,
usera.mobile,
usera.gender,
usera.email,
usera.weixinid,
usera.enable,
usera.avatar,
usera.status,
usera.creattime,
usera.updatetime,
usera.creatuser FROM
(
SELECT a.*
FROM
t_user_temp a
WHERE NOT EXISTS
( SELECT * FROM t_user_temp c INNER JOIN t_user b ON c.userid = b.userid WHERE a.userid = b.userid )
) usera;