他本来也可以删掉很多重复的语句，省去很多页数。
He could also have cut out much of the repetition and thus saved many pages.
通过使用预处理语句，可以避免重复分析/编译/优化周期。
By using a prepared statement you avoid repeating the analyze/compile/optimize cycle.
forall语句为阵列中的每一个元素重复另外一个语句。
The FORALL statement repeats another statement for each of the elements in an array.
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