OCP-051-004
4. Which two statements are true regarding single row functions? (Choose two.)
--下列关于简单函数描述正确的是
A. They accept only a single argument. --select concat('a','b') from dual;
B. They can be nested only to two levels. --select upper(lower(concat('a','b'))) from dual;
C. Arguments can only be column values or constants. --select concat('a','b') from dual;
D. They always return a single result row for every row of a queried table.
E. They can return a data type value different from the one that is referenced.
--下列关于简单函数描述正确的是
A. They accept only a single argument. --select concat('a','b') from dual;
B. They can be nested only to two levels. --select upper(lower(concat('a','b'))) from dual;
C. Arguments can only be column values or constants. --select concat('a','b') from dual;
D. They always return a single result row for every row of a queried table.
E. They can return a data type value different from the one that is referenced.
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