我正在执行插入查询，如果已经存在唯一键，则许多列中的大多数都需要更新为新值。它是这样的:
INSERT INTO lee(exp_id, created_by,
location, animal,
starttime, endtime, entct,
inact, inadur, inadist,
smlct, smldur, smldist,
larct, lardur, lardist,
emptyct, emptydur)
SELECT id, uid, t.location, t.animal, t.starttime, t.endtime, t.entct,
t.inact, t.inadur, t.inadist,
t.smlct, t.smldur, t.smldist,
t.larct, t.lardur, t.lardist,
t.emptyct, t.emptydur
FROM tmp t WHERE uid=x
ON DUPLICATE KEY UPDATE ...;
//update all fields to values from SELECT,
// except for exp_id, created_by, location, animal,
// starttime, endtime
我不确定 UPDATE 子句的语法应该是什么。如何从 SELECT 子句引用当前行？
最佳答案
MySQL 将假定 equals 之前的部分引用 INSERT INTO 子句中命名的列，第二部分引用 SELECT 列。
INSERT INTO lee(exp_id, created_by, location, animal, starttime, endtime, entct,
inact, inadur, inadist,
smlct, smldur, smldist,
larct, lardur, lardist,
emptyct, emptydur)
SELECT id, uid, t.location, t.animal, t.starttime, t.endtime, t.entct,
t.inact, t.inadur, t.inadist,
t.smlct, t.smldur, t.smldist,
t.larct, t.lardur, t.lardist,
t.emptyct, t.emptydur
FROM tmp t WHERE uid=x
ON DUPLICATE KEY UPDATE entct=t.entct, inact=t.inact, ...
关于mysql - INSERT INTO ... SELECT FROM ... ON DUPLICATE KEY UPDATE，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/2472229/