mysql怎么实现,分区排序,一级类目先按总销量排降序,各自一级类目下的二级类目,内部再排降序
时间: 2024-05-12 20:21:15 浏览: 45
分区排序可以利用MySQL的窗口函数来实现。具体步骤如下:
1.按照一级类目分区,计算每个一级类目的总销量。
```
SELECT
category1,
SUM(sales) AS total_sales
FROM
sales_table
GROUP BY
category1
```
2.使用窗口函数(OVER)按照总销量对一级类目进行降序排列。
```
SELECT
category1,
SUM(sales) AS total_sales,
ROW_NUMBER() OVER (ORDER BY SUM(sales) DESC) AS category1_rank
FROM
sales_table
GROUP BY
category1
```
3.将上述查询结果作为子查询,再按照一级类目和二级类目分区,计算每个二级类目的销量,并使用窗口函数按照销量对二级类目进行降序排列。
```
SELECT
category1,
category2,
SUM(sales) AS total_sales,
ROW_NUMBER() OVER (PARTITION BY category1 ORDER BY SUM(sales) DESC) AS category2_rank
FROM
sales_table
GROUP BY
category1, category2
```
4.将上述查询结果作为子查询,按照一级类目和二级类目的排名进行排序。
```
SELECT
category1,
category2,
total_sales
FROM
(
SELECT
category1,
category2,
SUM(sales) AS total_sales,
ROW_NUMBER() OVER (PARTITION BY category1 ORDER BY SUM(sales) DESC) AS category2_rank
FROM
sales_table
GROUP BY
category1, category2
) AS t
ORDER BY
category1_rank, category2_rank
```
以上就是实现分区排序并对一级类目和二级类目进行排序的MySQL查询语句。
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