单选题
发布日期:2020-04-10
SELECT last_name, 12*salary* commission_pct FROM emp;
SELECT last_name, 12*salary* (commission_pct,0) FROM emp;
SELECT last_name, 12*salary*(nvl(commission_pct,0)) FROM emp;
SELECT last_name, 12*salary*(decode(commission_pct,0)) FROM emp;
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