我有这张桌子叫shop：
+---------+---------+------------+----------+
| shop_id | item_id | item_price | item_qty |
+---------+---------+------------+----------+
| 1 | 1 | 0 | 99 |
| 2 | 2 | 0 | 99 |
| 3 | 3 | 0 | 99 |
| 4 | 4 | 0 | 99 |
| 5 | 5 | 0 | 99 |
| 6 | 6 | 0 | 99 |
| 7 | 7 | 0 | 99 |
| 8 | 8 | 0 | 99 |
+---------+---------+------------+----------+
我也有这张名为item的表：
+---------+-----------------+-----------+----------+----------+----------+---------------------------------+-----------+------------+
| item_id | item_name | item_type | item_atk | item_def | item_atr | item_img | item_desc | item_price |
+---------+-----------------+-----------+----------+----------+----------+---------------------------------+-----------+------------+
| 0 | Halberd | 1 | 220 | 20 | 0 | pics/weapons/halberd.png | | 400 |
| 1 | Axe | 1 | 220 | 10 | 0 | pics/weapons/axe.png | | 200 |
| 2 | Wooden Sword | 1 | 70 | 0 | 0 | pics/weapons/wooden-sword.png | | 225 |
| 3 | Dagger | 1 | 60 | 5 | 0 | pics/weapons/dagger.png | | 55 |
| 4 | Bow | 1 | 120 | 1 | 0 | pics/weapons/bow.png | | 120 |
| 5 | Helmet | 4 | 0 | 50 | 0 | pics/headgears/helmet.png | | 155 |
| 6 | Tunic | 2 | 10 | 10 | 0 | pics/armors/tunic.png | | 50 |
| 7 | Armour | 2 | 0 | 75 | 0 | pics/armors/armour.png | | 150 |
| 8 | Necklace | 3 | 25 | 15 | 0 | pics/accessories/necklace.png | | 199 |
| 9 | Studded Leather | 2 | 25 | 60 | 0 | pics/armors/studded-leather.png | | 240 |
+---------+-----------------+-----------+----------+----------+----------+---------------------------------+-----------+------------+
我主要想这样做：根据item表的 *item_price* 更新shop表的 *item_price* 。
免责声明
询问此查询的目的是从 item_price 表中填写我的商店 item_price。但在未来商店 item_price 将具有与 item_price 不同的值。
例如：
从商店购买的物品将使用商店 item_price。
出售给商店的商品将基于 item_price。