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数据库/LIMIT分页查询的错误 #6

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数据库/LIMIT分页查询的错误 #6

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18 changes: 18 additions & 0 deletions 数据库/数据库.md
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Original file line number Diff line number Diff line change
Expand Up @@ -254,6 +254,7 @@ SELECT * FROM Student ORDER BY Sage;
SELECT * FROM Student ORDER BY Sdept, Sage desc; //先按专业升序排序，然后同一专业按年龄降序排序
```


### 4）LIMIT

> 可以用于强制`SELECT`返回指定的记录数
Expand All @@ -269,6 +270,23 @@ SELECT * FROM Student ORDER BY Sdept, Sage desc; //先按专业升序排序，
SELECT * FROM Student LIMIT 5, 10; //返回记录行6-15
SELECT * FROM Student LIMIT 5; //返回前5个记录行
```
**修改**
### 4）LIMIT

```sql
SELECT * FROM Students LIMIT <M> OFFSET <N>
```
> 分页查询相关内容

* 1个参数LIMIT <M> 表示显示页的容量 pageSize
* 2个参数OFFSET <N> N由要查询的页数确定 pageSize*(pageIndex-1)

```sql
SELECT * FROM Students LIMIT 4 OFFSET 0 //每页四条记录值，查询第一页
SELECT * FROM Students LIMIT 4, 0;
SELECT * FROM Student LIMIT 5, 10; //返回记录行10-15
```


### 5）聚集函数

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