> For the complete documentation index, see [llms.txt](https://65480539.gitbook.io/gop1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://65480539.gitbook.io/gop1/di-yi-zhang-hou-duan-dai-ma/di-ba-ke.md).

# 第八课

第6-7课没有什么特殊之处，因此略过

本课时主要说的价格表

注意，并非一定要拆表。大部分时候和主表放在一起就可以了。课程里拆表主要是为了实现一些特殊业务逻辑和体现逼格

![](/files/-MNveLUIIYG0e14sXI2w)

#### 建表语句

```
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for course_prices
-- ----------------------------
DROP TABLE IF EXISTS `course_prices`;
CREATE TABLE `course_prices`  (
`id` int(11) NOT NULL AUTO_INCREMENT,
`course_id` int(11) NOT NULL COMMENT '商品ID',
`market_price` decimal(10, 2) NULL DEFAULT 0.00 COMMENT '市场价',
`sale_price` decimal(10, 2) NULL DEFAULT 0.00 COMMENT '销售价',
`setdate` datetime(0) NULL DEFAULT NULL COMMENT '价格设定时间',
`comment` varchar(500) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL COMMENT '备注',
`iscurrent` bit(1) NULL DEFAULT b'0' COMMENT '是否是当前价格',
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;

SET FOREIGN_KEY_CHECKS = 1;
```

课后作业

#### 根据前面几课时的内容把 相关字段划分值对象


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