http://blog.csdn.net/yy_mm_dd/article/details/3182953
SQL> create table idtable (id number,name varchar2(30)); Table created
SQL> insert into idtable values(10,'ab'); 1 row inserted
SQL> insert into idtable values(10,'bc'); 1 row inserted
SQL> insert into idtable values(10,'cd'); 1 row inserted
SQL> insert into idtable values(20,'hi'); 1 row inserted
SQL> insert into idtable values(20,'ij'); 1 row inserted
SQL> insert into idtable values(20,'mn'); 1 row inserted
SQL> select * from idtable; ID NAME
---------- ------------------------------ 10 ab 10 bc 10 cd
20 hi 20 ij 20 mn 6 rows selected
SQL> select id,wmsys.wm_concat(name) name from idtable 2 group by id; ID NAME
---------- -------------------------------------------------------------------------------- 10 ab,bc,cd 20 hi,ij,mn
SQL> select id,wmsys.wm_concat(name) over (order by id) name from idtable; ID NAME
---------- -------------------------------------------------------------------------------- 10 ab,bc,cd 10 ab,bc,cd 10 ab,bc,cd 20 ab,bc,cd,hi,ij,mn 20 ab,bc,cd,hi,ij,mn 20 ab,bc,cd,hi,ij,mn 6 rows selected
SQL> select id,wmsys.wm_concat(name) over (order by id,name) name from idtable; ID NAME
---------- -------------------------------------------------------------------------------- 10 ab 10 ab,bc 10 ab,bc,cd 20 ab,bc,cd,hi 20 ab,bc,cd,hi,ij 20 ab,bc,cd,hi,ij,mn 6 rows selected
个人觉得这个用法比较有趣.
SQL> select id,wmsys.wm_concat(name) over (partition by id) name from idtable; ID NAME
---------- -------------------------------------------------------------------------------- 10 ab,bc,cd 10 ab,bc,cd 10 ab,bc,cd 20 hi,ij,mn 20 hi,ij,mn 20 hi,ij,mn 6 rows selected
SQL> select id,wmsys.wm_concat(name) over (partition by id,name) name from idtable; ID NAME
---------- -------------------------------------------------------------------------------- 10 ab 10 bc 10 cd 20 hi 20 ij 20 mn 6 rows selected （转）WMSYS.WM_CONCAT 函数的用法 select t.rank, t.Name from t_menu_item t; 10 CLARK 10 KING 10 MILLER 20 ADAMS 20 FORD 20 JONES 20 SCOTT
wmsys.wm_concat的几个用法(行转列)
