sql - 用逗号分割一列

Question

我有返回结果的 oracle 查询

Column1  Column2  Column3
  1        -A,D    -DEF
  2        -B,C    -JHI

我怎样才能得到这样的结果

Column1 Column2  Column3  Column4
  1       -A       -D      -DEF

Answer 1

利用SUBSTRING函数接收部分字符串和INSTR查找逗号位置的函数。

select
    column1,
    substring(column2,1,instr(column2,',')-1) as column2a,
    substring(column2,instr(column2,',')+1) as column2b,
    column3
from mytable

示例： http ://sqlfiddle.com/#!2/ada12/12

Answer 2

请试试：

select
  Column1, 
  substr(Column2 , 1, instr(Column2, ',')-1) as Column2, 
  substr(Column2 , instr(Column2, ',')+1) as Column3, 
  Column3 as Column4 
from(
      select  1 as Column1, '-A,D' as Column2, '-DEF' as Column3 from dual
)x