它也包含以下用途的指令：创建和删除集合、指定查询结果如何被格式化，以及提供用户凭证。
It also includes instructions to create and drop collections, to specify how the query results are formatted, and to supply user credentials.
注意，每个查询都包含aip键、用户ID，有时还包含被修改或删除的商品的ID。
Notice that each query includes the API key, user ID, and, in some cases, the ID of the item being modified or deleted.
注意，第二个SQL查询包含了一个问号(？)占位符—运行时，此占位符被data数组中指定的字段当前值替代。
Notice that this second SQL query contains a question mark (?) placeholder - at run-time, this placeholder is replaced by the current value of the fields specified in the data array.
从语法上来说,子查询被包含在圆括号中.
Syntactically, subqueries are enclosed within parentheses. For example, the following SELECT statement contains a simple subquery in its WHERE clause
子查询是被包含在一组圆括号里执行的。
A subquery is executed by enclosing it in a set of parentheses.
使用这些实体化视图，用户的查询能够被迅速地回答，因为这种办法可以避免查询基数据中所包含的其他数据源。
Using these materialized views, user queries can be answered quickly because querying the external sources where the base data reside is avoided.
使用这些实体化视图，用户的查询能够被迅速地回答，因为这种办法可以避免查询基数据中所包含的其他数据源。
Using these materialized views, user queries can be answered quickly because querying the external sources where the base data reside is avoided.
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