72.Which tasks can be performed using SQL functions built into Oracle Database ? (Choose three.)

72.Which tasks can be performed using SQL functions built into Oracle Database ? (Choose three.)

A.displaying a date in a nondefault format

B.finding the number of characters in an expression

C.substituting a character string in a text expression with a specified string

D.combining more than two columns or expressions into a single column in the output

答案：ABC

解析：那个可以使用oracle内置函数来完成

A:非默认格式显示日期，to_char

B:一个表达式的字符数，length

C:用指定的字符串替换子串，replace

D:连接多余两列，contack只能连接一列