Why Scalar Subquery expression cannot be used in HAVING clauses?

Hi All,
I'm new to SQL. I'm confused with Scalar Subquery.
Is there anyone who can answer me why Scalar Subquery expression cannot be used in HAVING clauses.
Can you show me a example?
Thanks very much,
Xianyi.Ye
Edited by: 908428 on 2012-1-16 下午7:24

Hi,
908428 wrote:
Hi Frank,
Thank you for your quick reply. I also agree with your point.
But when I read the book, "OCA Oracle Database SQL Certified Expert Exam Guide",( link to illegal copies of book removed by moderator )
on Page 359, it said that
Scalar subquery expressions cannot be used in the following locations:
1. In CHECK constraints
2. In GROUP BY clauses
3. In HAVING clauses
4. In a function-based index (which is coming up in Chapter 11)
5. As a DEFAULT value for a column
6. In the RETURNING clause of any DML statement
7. In the WHEN conditions of CASE
8. In the START WITH and CONNECT BY clauses, which we discuss in
Chapter 16.7 and 8 are wrong. Scalar sub-queries can be used in WHEN conditions and START WITH and CONNECT BY clauses. (At least in Oracle 10.2. Is the book based on some earlier version?)
Edited by: BluShadow on 17-Jan-2012 09:08

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