OCP-1Z0-051 第133題 子查詢的用法
B選項不正確,同一層可以放多個子查詢。
C選項不正確,INSERT、UPDATE、DELETE、SELECT、CREATE TABLE等這些語句中都可以使用子查詢。
D選項正確。
E選項不正確,WHERE子句中的巢狀子查詢最多能巢狀255層。
聯機文件中有詳細說明:
http://docs.oracle.com/cd/E11882_01/server.112/e41084/queries007.htm#SQLRF52357
摘錄如下:
A subquery can contain another subquery. Oracle Database imposes no limit on the number of subquery levels in the FROM clause of the top-level query. You can nest up to 255 levels of subqueries in the WHERE clause.
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OCP-1Z0-051 第133題 子查詢的用法
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