Your table is already locked by some query.
(您的表已被某些查询锁定。)
For example, you may have executed "select for update" and have not yet committed/rollbacked and fired another select query. (例如，您可能已执行“选择更新”，但尚未提交/回滚并触发了另一个选择查询。)
Do a commit/rollback before executing your query. (在执行查询之前执行提交/回滚。)
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