舉例：mysql
| id | value |
| 1 | 1,2,3,4 |
| 2 | 2,3,4,5,6 |
拆分紅：sql
| id | value |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 5 |
| 6 | 6 |
select distinct substring_index(substring_index(a.value,',',b.help_topic_id+1),',',-1) from table a join mysql.help_topic b on b.help_topic_id < (length(a.value) - length(replace(a.value,',',''))+1)
distinct：去重複操做spa
a.value：表別名.須要拆分的字段名code
table a：表名 別名blog
help_topic：自增加表ci