目录前言形参（形式参数）实参（实际参数）形参和实参的区别和联系前言 如果把函数比喻成一台机器，那么参数就是原材料，返回值就是最终产品；从一定程度上讲，函数的作用就是根据不同的参数产生不同的返回值。
(At first glance this may look like a duplicate of Different execution plan when executing statement directly and from stored procedure or Why does the SqlServer optimizer get so confused with paramet
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