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Update ch02: 基础查询与排序.md

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mba1398
2022-02-05 11:33:06 +08:00
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commit 1ad54e509e
1 changed files with 5 additions and 18 deletions
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ch02: 基础查询与排序.md
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@@ -146,31 +146,18 @@ SELECT product_name, product_type, sale_price
WHERE sale_price >= 1000;
```
查询结果如下：
```plain
+--------------+--------------+------------+
| product_name | product_type | sale_price |
+--------------+--------------+------------+
| T恤 | 衣服 | 1000 |
| 运动T恤 | 衣服 | 4000 |
| 菜刀 | 厨房用具 | 3000 |
| 高压锅 | 厨房用具 | 6800 |
+--------------+--------------+------------+
```
-- 向代码清单2-30的查询条件中添加NOT运算符
![图片](./img/ch02/ch02.00-not-230.png)
向代码清单2-30的查询条件中添加NOT运算符
```sql
SELECT product_name, product_type, sale_price
FROM product
WHERE NOT sale_price >= 1000;
```
查询结果如下：
```sql
product_name | sale_price | purchase_price
-------------+------------+------------
T恤衫 | 　 1000 | 500
运动T恤 | 4000 | 2800
高压锅 | 6800 | 5000
```
![图片](./img/ch02/ch02.00-not-231.png)
## 2.3.2 AND运算符和OR运算符