本文探讨了SQL查询中WHERE与HAVING子句的正确使用方式，通过一个具体的示例，解释了如何在GROUP BY操作后应用条件筛选，特别是如何在HAVING子句中使用BETWEEN运算符。文章指出，在GROUP BY之后使用HAVING子句来过滤聚合数据是完全合法的，并给出了正确的执行结果。
6、（4-21） choose the best answer:
View the Exhibit and examine the structure of the CUSTOMERS table.
Evaluate the following SQL statement:
SQL> SELECT cust_city, COUNT(cust_last_name)
FROM customers
WHERE cust_credit_limit > 1000
GROUP BY cust_city
HAVING AVG(cust_credit_limit) BETWEEN 5000 AND 6000;
Which statement is true regarding the outcome of the above query?
A) It executes successfully.
B) It returns an error because WHERE and HAVING clauses cannot be used in the same SELECT statement.
C) It returns an error because WHERE and HAVING clauses cannot be used to apply conditions on
the same column.
D) It returns an error because the BETWEEN operator cannot be used in the HAVING clause.
Answer:A
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