混合中的两个表格:
项目
| item_id | user_id | data |
----------------------------
| 10 | 100 | A |
| 11 | 100 | C |
| 12 | 101 | E |
| 13 | 101 | G |
item_detail
| id | item_id | ignore | detail1 | detail2 | detail3 | detail4 |
-----------------------------------------------------------------
| 1 | 10 | 0 | h1 | h2 | h3 | h4 |
| 2 | 10 | 0 | g1 | g2 …