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单项选择题 Management has asked you to calculate the value 12*salary* commission_pct for all the employees in the EMP table. The EMP table contains these columns: LAST NAME VARCNAR2(35) NOT NULL SALARY NUMBER(9,2) NOT NULL COMMISION_PCT NUMBER(4,2) Which statement ensures that a value is displayed in the calculated columns for all employees?（）

A、SELECT last_name, 12*salary* commission_pct FROM emp;

B、SELECT last_name, 12*salary* (commission_pct,0) FROM emp;

C、SELECT last_name, 12*salary*(nvl(commission_pct,0)) FROM emp;

D、SELECT last_name, 12*salary*(decode(commission_pct,0)) FROM emp;

  • C

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