（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：（A、B、C）

解析：

A，TO_CHAR

B，LENGTH

C，REPLACE

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OCP 1Z0-051-72