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Re: INSERT AfTER LEFT JOIN creates duplicate records
Posted by: Rick James
Date: October 03, 2016 11:18PM

* What was the value of autocommit? Was this in a BEGIN...COMMIT? Show us some details.
* `SOTRAN` really should have a PRIMARY KEY.
* Was Replication involved?
* `part_num` and `item` are declared the same. Fix that. (No, I can't see how that would cause the problem.)
* Could the two inserts have come from different connections? Or the same connection?
* Shouldn't (so_num, part_num) be UNIQUE? Better yet, make it the PRIMARY KEY? And, since you do not have such a composite INDEX, the query is much more inefficient than it should be.
* Making that pair UNIQUE (or PRIMARY) would let you use `INSERT IGNORE`, thereby avoiding the clumsy SELECT+LEFT JOIN.

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Re: INSERT AfTER LEFT JOIN creates duplicate records
October 03, 2016 11:18PM

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