Information about all SQL statements executed before the lock-timeout event in the participating transactions, such as statement text, isolation level used, order of execution, and so on.

在参与事务中的锁超时事件前执行的所有sql语句信息，如语句文本、使用的隔离级、执行顺序等等。

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Execution always begins at the first statement of the program. Statements are run one at a time, in order from top to bottom.

为了确保一个函数在首次被调用之前已经定义，你必须要之道语句运行的顺序，也就是所谓『运行流程』。

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