SQL服务器：根据多个条件在组中搜索

Question

我有以下 Product table。我正在尝试根据多个标准查找产品。

这是我的示例数据：

+-----------+------------+------------------+----------------+-----------------+-------+
| productid |  barcode   |   product_name   | is_product_new | premium_service | price |
+-----------+------------+------------------+----------------+-----------------+-------+
|         1 | 1122334455 | rubber duck      |              0 |               0 |  3,00 |
|         2 | 1122334455 | rubber duck      |              1 |               0 |  4,00 |
|         3 | 1122334455 | rubber duck      |              1 |               0 |  5,00 |
|         4 | 1122334455 | rubber duck      |              1 |               1 |  6,00 |
|         5 | 2233445566 | barbie doll      |              1 |               0 | 10,00 |
|         6 | 2233445566 | barbie doll      |              0 |               0 |  8,00 |
|         7 | 3344556677 | actionman figure |              1 |               1 | 22,00 |
|         8 | 3344556677 | actionman figure |              1 |               0 | 18,00 |  
|         9 | 3344556677 | actionman figure |              0 |               0 |  6,00 |
|        10 | 3344556677 | actionman figure |              0 |               0 |  5,00 |
+-----------+------------+------------------+----------------+-----------------+-------+

一共有三个产品。

我想在提供优质服务的产品中搜索新价最低、二手价最低和溢价的产品。

我的预期结果是：

+-----------+------------+------------------+------------------+------------------+-----------------+
| productid |  barcode   |   product_name   | lowest_old_price | lowest_new price |   premium_price |
+-----------+------------+------------------+------------------+------------------+-----------------+
|         1 | 1122334455 | rubber duck      |             3.00 |             4.00 |            6.00 |
|         7 | 3344556677 | actionman figure |             5.00 |            18.00 |           22.00 |
+-----------+------------+------------------+------------------+------------------+-----------------+

我尝试编写一个带有 group by 和 having 子句的查询，但我的结果没有任何意义！即使我不确定我需要使用哪个 functions/clause！

需要你的帮助...

Answer 1

嗯。 . .如果我理解正确的话，这是带有 having 子句的条件聚合：

select min(productid) as productid, barcode, product_name
       min(case when is_product_new = 0 then price end) as old_price,
       min(case when is_product_new = 1 then price end) as new_price,
       min(case when premium_service = 1 then price end) as premium_price
from products p
group by productid, barcode, product_name
having max(premium_service) = 1;

如果premium_service是位，可以转换成整数：

having max(convert(int, premium_service)) = 1

SQL服务器：根据多个条件在组中搜索

SQL Server : search among groups based on multiple conditions

sql

sql-server

having-clause