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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、外查詢的 where 子句來開始評(píng)估;2、外查詢從表中取出候選行;3、表中隨后的行也重復(fù)這一過程，直到所有的行都被處理;4、外查詢的值傳到內(nèi)查詢中，內(nèi)部查詢用這個(gè)值進(jìn)行自己查詢的評(píng)估之后，得到的行被內(nèi)查詢返回到外查