Oracle 10G Developer Training OCA Oracle Certified Associate

Identify the characteristics of each subquery type

In which order does the Oracle Server evaluate clauses?

A. HAVING, WHERE, GROUP BY
B. WHERE, GROUP BY, HAVING
C. GROUP BY, HAVING, WHERE
D. WHERE, HAVING, GROUP BY

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Answer: B

Explanation:
Answer B is correct because the Oracle server first evaluate WHERE clause to reduce
number of rows that need to be processed, than GROUP BY clause and after that
HAVING clause.
Incorrect Answers:
A: Order of clauses evaluation is incorrect because WHERE clause will be processed
first.
C: Order of clauses evaluation is incorrect because WHERE clause will be processed
first.
D: Order of clauses evaluation is incorrect because HAVING clause cannot be processed
before GROUP BY clause.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 60-64
Chapter 2: Advanced Data Selection in Oracle