優化SQL查詢取消訂單

Question

這裏是我的表的子集：

orders: 
- order_id 
- customer_id 

order_products: 
- order_id 
- order_product_id (unique key) 
- canceled 

我想選擇一個給定客戶的所有訂單（ORDER_ID）（CUSTOMER_ID），所有的產品訂單都是取消了，不僅僅是一些產品。是否有這樣做比這更優雅的或有效的方法：

select order_id from orders 
where order_id in (
    select order_id from orders 
    inner join order_products on orders.order_id = order_products.order_id 
    where order_products.customer_id = 1234 and order_products.canceled = 1 
) 
and order_id not in (
    select order_id from orders 
    inner join order_products on orders.order_id = order_products.order_id 
    where order_products.customer_id = 1234 and order_products.canceled = 0 
) 

Answer 1

如果所有訂單都在order_products至少一行，試試這個

Select order_id from orders o 
Where Not Exists 
     (Select * From order_products 
     Where order_id = o.order_id 
      And cancelled = 1) 

如果上述假設是不正確的，那麼您還需要：

Select order_id from orders o 
Where Exists 
     (Select * From order_products 
     Where order_id = o.order_id) 
    And Not Exists 
     (Select * From order_products 
     Where order_id = o.order_id 
      And cancelled = 1) 

Answer 2

SELECT customer_id, order_id, count(*) AS product_count, sum(canceled) AS canceled_count 
FROM orders JOIN order_products 
ON orders.order_id = order_products.order_id 
WHERE customer_id = <<VALUE>> 
GROUP BY customer_id, order_id 
HAVING product_count = canceled_count 

Answer 3

最快的方式將是這樣的：

SELECT order_id 
FROM orders o 
WHERE customer_id = 1234 
     AND 
     (
     SELECT canceled 
     FROM order_products op 
     WHERE op.order_id = o.order_id 
     ORDER BY 
       canceled DESC 
     LIMIT 1 
     ) = 0 

子查詢將返回0當且僅當已經有一些產品，他們都被取消。

如果根本沒有產品，子查詢將返回NULL;如果至少有一個未被取消的產品，子查詢將返回1。

確保您有order_products (order_id, canceled)

Answer 4

像這樣的指標？這假設每個訂單至少有一個產品，否則此查詢將返回沒有任何產品的訂單。

select order_id 
from orders o 
where not exists (select 1 from order_products op 
        where canceled = 0 
        and op.order_id = o.order_id 
) 
and o.customer_id = 1234 

Answer 5

你可以嘗試這樣的事情

select orders.order_id 
from @orders orders inner join 
     @order_products order_products on orders.order_id = order_products.order_id 
where order_products.customer_id = 1234 
GROUP BY orders.order_id 
HAVING SUM(order_products.canceled) = COUNT(order_products.canceled) 

Answer 6

因爲我們不知道的數據庫平臺，這裏是一個ANSI標準方法。請注意，這不會假定架構（即取消字段的數據類型，如何設置取消標誌（即'YES'，1等）），並且沒有針對特定的數據庫平臺使用任何特定的數據庫平臺（這可能是更有效的方法，如果你可以給我們的平臺和版本您正在使用）：

select op1.order_id 
from (
      select op.order_id, cast(case when op.cancelled is not null then 1 else 0 end as tinyint) as is_cancelled 
      from #order_products op 
     ) op1 
group by op1.order_id 
having count(*) = sum(op1.is_cancelled);