SQL

Question

我有两个数据tables -

订单级别：

Order_number | order total | etc
Order_num1   | 
Order_num2   |

订单项级别：

Order_number | sku  | quantity | etc    
Order_num1   | sku1 | 3    
Order_num1   | sku2 | 2    
Order_num2   | sku1 | 4

等等。

我正在尝试编写一个 returns 任何 Order_numX 包含 skuY 和 skuZ 的查询。

我正在考虑以某种方式对订单项进行分组 table，但我不确定。

感谢任何帮助！谢谢。

Answer 1

所以我建议你使用 EXISTS 函数：

SELECT *
FROM Order
WHERE EXISTS(SELECT 1
             FROM line-item
             WHERE line-item.Order_number=Order.Order_number
             AND line-item.sku='skuY'
             )
AND EXISTS(SELECT 1
             FROM line-item
             WHERE line-item.Order_number=Order.Order_number
             AND line-item.sku='skuZ'
             )

此查询为您提供子 table 的 sku 列的 skuY 和 skuZ 值的订单，这里是 line-item

Answer 2

您可以使用聚合和 having:

select order_number
from line_item
where sku in (?, ?)
group by order_number
having count(distinct sku) = 2;  -- number of items in list

Answer 3

SELECT Order_number 
FROM line_item 
GROUP BY Order_number 
HAVING COUNT( CASE WHEN sku = skuY THEN 1 END) > 0
   AND COUNT( CASE WHEN sku = skuZ THEN 1 END) > 0

SQL - 当两行或更多行的值满足条件时返回值

SQL - returning values when a condition is met for that value over two or more rows

database

group-by

uniqueidentifier