A、SELECT emID AS 员工编号, (WHEN emSex="0" THEN "女 ELSE "男’ END)AS 性别, emName AS姓名 FROM employee; B、SELECT emID AS 员工编号, (IF emSex="0" THEN "女 ELSE "男’ END)AS 性别, emName AS姓名 FROM employee; C、SELECT emID AS 员工编号, (CASE WHEN emSex="0" THEN "女 ELSE "男’ END)AS 性别, emName AS姓名 FROM employee; D、SELECT emID AS 员工编号, (CASE emSex="0" THEN "女 ELSE "男’ END)AS 性别, emName AS姓名 FROM employee;