Perhaps the most useful prepared statements are those that not only take input values, but also operate on the current row of a cursor.

或许最有用的准备好的语句不仅可以获取输入值，而且还可以对游标的当前行进行操作。

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The ending index value of this set of elements can be calculated only by adding up the total number of values that occurred in all preceding slices plus the current slice.

计算这个元素集的结束索引值的惟一方法是，求出前面的所有片和当前片中出现的值的总数。

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Select fields display only the current value; you must drop down the list to see all of the possible values.

选择字段只显示当前值；您必须下拉该列表才能查看所有可能的值。

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