Choose two.

Which two statements are true about single row functions?

A) CONCAT : can be used to combine any number of values

B) MOD : returns the quotient of a division operation

C) CEIL : can be used for positive and negative numbers

D) FLOOR : returns the smallest integer greater than or equal to a specified number

E) TRUNC : can be used with NUMBER and DATE values

Answer：：CE

(解析：concat 函数只能连接两个字符串或者两个列的值。

ceil 函数向上取整数。

floor 函数向下取整。)

SQL> select ceil(-500.1) from dual;

CEIL(-500.1)

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-500

SQL> select ceil(-500.99999) from dual;

CEIL(-500.99999)

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-500

SQL> select floor(-500.1) from dual;

FLOOR(-500.1)

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-501