Part 6 of this series discussed type mismatches in expressions and suggested that casting functions be used to guarantee that a calculated value will come through with the proper type.

本系列的第6部分讨论了表达式中的类型不匹配，并建议使用类型转换函数来保证计算结果得到正确的类型。

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As part of the transformation, the optimizer also determines the correct table join order, rewrites expressions, and eliminates any redundancy from the SQL.

作为转换的一部分，优化器还决定正确的表联接顺序，重写表达式，并从SQL中消除任何冗余。

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You can simplify the stylesheet by factoring out a common part of the expressions.

通过提取出表达式的常用部分，您可以对样式表进行简化。

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The Palestinians, for their part, have been keeping their public comments to unwontedly mild expressions of cynicism, no doubt at America's urging.

ECONOMIST: Israel