oracle列轉行和以逗號擷取字串的混合使用

最近，在寫儲存過程給前端返回值的時候，用到了行轉列和擷取字串的混合使用

要轉換的資料

想要實現的資料

實現sql

```sql

select old_reel,old_qty,substr(reel,0,decode(instr(reel, ','),0,length(reel),instr(reel, ',') - 1)) as newreel1,
substr(qty1,0,decode(instr(qty1, ','),0,length(qty1),instr(qty1, ',') - 1)) as reelqty1,
substr(reel,decode(instr(reel, ','),0,length(reel),instr(reel, ',') + 1)) as newreel2,
substr(qty1,decode(instr(qty1, ','),0,length(qty1),instr(qty1, ',') + 1)) as reelqty2 from (select old_reel, 
old_qty, 
listagg(new_reel,',') within group (order by new_reel) over (partition by old_reel) reel, 
listagg(qty,',') within group (order by qty) over (partition by old_qty) qty1 
from wms_reel_iqc where old_reel='551r17083000056') t where rownum=1;

##### 說明：1.

`select old_reel, 
old_qty, 
listagg(new_reel,',') within group (order by new_reel) over (partition by old_reel) reel, 
listagg(qty,',') within group (order by qty) over (partition by old_qty) qty1 
from wms_reel_iqc where old_reel='551r17083000056'` 此sql實現行轉列，用到的函式listagg
2.`select old_reel,old_qty,substr(reel,0,decode(instr(reel, ','),0,length(reel),instr(reel, ',') - 1)) as newreel1,
substr(qty1,0,decode(instr(qty1, ','),0,length(qty1),instr(qty1, ',') - 1)) as reelqty1,
substr(reel,decode(instr(reel, ','),0,length(reel),instr(reel, ',') + 1)) as newreel2,
substr(qty1,decode(instr(qty1, ','),0,length(qty1),instr(qty1, ',') + 1)) as reelqty2`此sql實現以逗號『，』擷取字串，如果要其他擷取字串，把逗號換成你想要的字元即可。

Oracle行轉列和列轉行

1.1 初始測試資料 表結構 test tb grade sql 1 create table test tb grade 2 3 id number 10 not null,4 user name varchar2 20 char 5 course varchar2 20 char 6 score...

Oracle行轉列和列轉行

一 行轉列 1.1 初始測試資料 表結構 test tb grade sql 1 create table test tb grade 2 3 id number 10 not null,4 user name varchar2 20 char 5 course varchar2 20 char 6...

Oracle行轉列和列轉行

一 行轉列 1.1 初始測試資料 表結構 test tb grade sql 1 create table test tb grade 2 3 id number 10 not null,4 user name varchar2 20 char 5 course varchar2 20 char 6...