一流员工总是在意料之外出现，你只能在聘雇时尽可能判断，然后给他们表现的机会。

First-rate employees turn up unexpectedly. All you can do is to make your best guess in hiring people and give them a chance to perform.

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往后每当要指定不同聘雇日期时，即可执行预存程序。

You can then run the stored procedure each time you want to specify a different hire date.

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