"WM_CONCAT": 标识符无效，这个要怎么办
SQL> select deptno,wm_concat(ename) from emp group by deptno;
select deptno,wm_concat(ename) from emp group by deptno
*
第 1 行出现错误:
ORA-00904: "WM_CONCAT": 标识符无效
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SQL> select deptno,wm_concat(ename) from emp group by deptno;
select deptno,wm_concat(ename) from emp group by deptno
*
第 1 行出现错误:
ORA-00904: "WM_CONCAT": 标识符无效
2016-12-06
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