OCP-1Z0-051 第133題子查詢的用法

阿新 • • 發佈：2019-02-12

A選項正確。
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.

OCP-1Z0-051 第133題子查詢的用法

A選項正確。 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:

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