【OCP-12c】2019年OCP认证考试原题解析(071-85题)
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85、The following are the steps for a correlated subquery, listed in random order:
1. The WHEREclause of the outer query is evaluated.
2. The candidate row is fetched from the table specified in the outer query.
3. This is repeated for the subsequent rows of the table, till all the rows are processed.
4. Rows are returned by the inner query, after being evaluated with the value from the candidate row in the outer query.
Which is the correct sequence in which the Oracle server evaluates a correlated subquery?
A. 2, 1, 4, 3
B. 4, 1, 2, 3
C. 4, 2, 1, 3
D. 2, 4, 1, 3
Correct Answer: D
Section: (none) Explanation:1、外查询的 where 子句来开始评估;2、外查询从表中取出候选行;3、表中随后的行也重复这一过程,直到所有的行都被处理;4、外查询的值传到内查询中,内部查询用这个值进行自己查询的评估之后,得到的行被内查询返回到外查