The old version of the redistribute utility USES special insert and delete with sub-select statements.

旧版本的重分发实用程序通过子选择语句使用特殊的insert和delete。

youdao

This compares more to a sub-select within an SQL where clause, but the XQuery syntax seems more intuitive and natural.

更像是 SQL where 子句中的子选择，但是 XQuery 语法看起来更直观自然。

youdao

The inner-most sub-select identifies all rows that need to be updated; the user might have given some conditions to restrict the rows.

最里边的子查询找出所有需要更新的行；用户可能已经给出了一些条件来限制这些行。

youdao