Is inside the SQL FOR UPDATE to add the lock, when to release-CodePudding

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Is inside the SQL FOR UPDATE to add the lock, when to release

Time：09-16

1. If the words in a transaction, it is in a transaction commit or rollback release

2. Under special circumstances, use the SELECT alone... FOR UPDATE, later used alone UPDATE statement, the lock is in the SELECT immediately after release, or after the UPDATE release?

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