【12c OCP认证】2019年度OCP最新考试题库-071.89题
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89、Which three statements are true regarding group functions? (Choose three.)
A. They can be used on columns or expressions.
B. They can be passed as an argument to another group function.
C. They can be used only with a SQL statement that has the GROUP BYclause.
D. They can be used on only one column in the SELECT clause of a SQL statement.
E. They can be used along with the single-row function in the SELECTclause of a SQL statement.
Correct Answer: ABE
Section: (none)
Explanation(函数可以用在表达式中,比如 avg(sal+100);函数可以嵌套;也可以跟单行函数
一起使用:
select substr(d.dname,1,3),avg(e.sal)
from dept d,emp e
group by d.dname;