列出所有部门的职工人数(包括没有职工的部门) ( )
A.
select dept.deptno,dname,count(emp.empno) from emp,dept where emp.deptno=dept.deptno group by dept.deptno,dname;
B.
select dept.deptno,dname,count(emp.empno) from emp,dept where emp.deptno(+)=dept.deptno group by dept.deptno,dname;
C.
select dept.deptno,dname,count(emp.empno) from emp,dept where emp.deptno=dept.deptno(+) group by dept.deptno,dname;
D.
select dept.deptno,dname,count(emp.empno) from emp,dept where emp.deptno(+)=dept.deptno(+)group by dept.deptno,dname;