问题
单项选择题
设有职工基本表:EMP(ENO,ENAME,AGE,SEX,SALARY),其属性分别表示职工号、姓名、年龄、性别、工资。为每个工资低于平均工资的女职工加薪200元,以下SQL语句正确的是______。
A.UPDATE EMP SET SALARY=SALARY+200
WHERE SALAEY<(SELECT AVG(SALARY)FROM EMP) AND SEX=’女’
B.UPDATE FROM EMP SET SALARY=200
WHERE SALAEY<(SELECT SUM(SALARY)FROM EMP) AND SEX=’女’
C.UPDATEEMP SET SALARY=200
WHERE SALAEY<(SELECT AVG(SALARY)FROM EMP) AND SEX=’女’
D.UPDATE FROM EMP SET SALARY=SALARY+200
WHERE SALAEY<fSELECT SUM(SALARY)FROM EMP) AND SEX=’女’
答案
参考答案:A