（73）Which tasks can be performed using SQL functions that are built into Oracle database ? (Choose three .)

A. finding the remainder of a division

B. adding a number to a date for a resultant date value

C. comparing two expressions to check whether they are equal

D. checking whether a specified character exists in a given string

E. removing trailing, leading, and embedded characters from a character string

答案：（A、C、D）

解析：

A，MOD

C，NULLIF

D，INSTR

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