passingby 子句建立了SQL和XQuery上下文间的绑定。

The passing by clause establishes the binding between the SQL and the XQuery context.

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多数情况下按照上述方法使用XQuery中的变量，即通过for子句隐式建立变量，而不是使用let子句显式地定义变量。

You most often will use variables in XQuery as shown above, though, where the variable is created implicitly by a for clause, rather than explicitly with a let clause.

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其思想是，在一个描述性级别上，在FROM 子句中建立一个临时表，这个表由在调用任何空间函数之前导入的数据组成。

The idea is, on a descriptive level, to build in the FROM clause a temporary table that consists of the data to be imported before calling any of the spatial functions.

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根据使用者名称资料行来建立具有where子句的检视。

Create a view that has a WHERE clause based on the user name column.

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根据使用者名称资料行来建立具有where子句的检视。

Create a view that has a WHERE clause based on the user name column.

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