--范例1
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select 10 deptno_case10, (select distinct case deptno when 10 then listagg(empno, ',') within group(order by ename) else null end deptno from emp where deptno = 10 group by deptno) name_case1, 20 deptno_case20, (select distinct case deptno when 20 then listagg(empno, ',') within group(order by ename) else null end deptno from emp where deptno = 20 group by deptno) name_case2, 30 deptno_case30, (select distinct case deptno when 30 then listagg(empno, ',') within group(order by ename) else null end deptno from emp where deptno = 30 group by deptno) name_case3 from emp
where rownum < 2 group by deptno;
select deptno,listagg(empno,',') within group (order by ename) ename123 from emp group by deptno;
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--范例2
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select deptno,listagg(empno,',') within group (order by ename) ename123 from emp group by deptno;
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