Typeor order by after distinct on with postgresql

Question

我下面有一个table：

id	product_id	price
1	1	100
2	1	150
3	2	120
4	2	190
5	3	100
6	3	80

我想select产品的最低价格并按价格排序

预期输出：

id	product_id	price
6	3	80
1	1	100
3	2	120

到目前为止我尝试了什么：

`
 repository.createQueryBuilder('products')
.orderBy('products.id')
.distinctOn(['products.id'])
.addOrderBy('price')
`

此查询 returns，最便宜的产品但未对它们进行排序。所以，addOrderBy 对产品没有影响。有没有办法在 distinctOn 之后对产品进行排序？

Answer 1

SELECT id,
       product_id,
       price
FROM   (SELECT id,
               product_id,
               price,
               Dense_rank()
                 OVER (
                   partition BY product_id
                   ORDER BY price ASC) dr
        FROM   product) inline_view
WHERE  dr = 1
ORDER  BY price ASC;

设置：

postgres=# create table product(id int, product_id int, price int);
CREATE TABLE
postgres=# inseert into values (1,1,100),(2,1,150),(3,2,120),(4,2,190),(5,3,100),(6,3,80);
INSERT 0 6

输出

id | product_id | price
----+------------+-------
  6 |          3 |    80
  1 |          1 |   100
  3 |          2 |   120
(3 rows)

Typeor order by after distinct on with postgresql

Typeorm order by after distinct on with postgresql

postgresql

sql-order-by

distinct

typeorm

distinct-on