Sub- selects 子查询
You can filter YQL results with WHERE clauses, and combine or "mash up" data from multiple services through the use of sub-selects.
您可以通过where子句筛选YQL结果，通过使用子选择来合并或“混搭”来自多个服务的数据。
The detail data declared in the sub-classes is loaded only when a user either selects the tree leaf or opens the tree node.
在子类中声明的详细数据只在用户选择这个树叶或打开树节点时才会装载。
OLTP transactions include selects, inserts, updates, and deletes, which normally complete in seconds or sub-seconds.
OLTP事务包括select、insert、update和delete，通常是以秒级或次秒级(sub - second)的速度完成的。
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