The expression used in the if statement (and in the elif clause and the while loop discussed later in this article) can be as complex as necessary.

if语句(以及本文后面讨论的elif子句和while循环)中的表达式可以很复杂。

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Additional predicates added to a complex WHERE clause, containing OR, and, and parentheses.

添加到复杂的where语句的额外谓词，包括OR、AND和括号。

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The filters in the on clause can contain complex queries or simple expressions.

on 子句中的过滤器能够包含复杂查询或者简单表达式。

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Options such as a buyout or sale of the partner's interest should be included in a buy- sell clause or, if complex, in a separate agreement.

WSJ: Small Business: Forming a Partnership