客户机的SQL计数特定项

我需要呈现下表，以了解客户支付了多少汉堡

顾客|汉堡1份|汉堡2份|

我有两张桌子：

• 客户表：带有CustomerID、名称
• 交易订单：带有TransactionOrderID CustomerID和BurgerCode

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我有6个汉堡代码，每一个我都需要添加一列，最好的方法是什么？

如果你不想使用pivot，你可以尝试这样的方法

   WITH cte AS
   ( 
   SELECT 
       CustomerID,
       SUM(CASE WHEN BurgerCode LIKE 'BurgerCode1' THEN 1 ELSE 0 END) AS Burger1Qty,
       SUM(CASE WHEN BurgerCode LIKE 'BurgerCode2' THEN 1 ELSE 0 END) AS Burger2Qty,
       SUM(CASE WHEN BurgerCode LIKE 'BurgerCode3' THEN 1 ELSE 0 END) AS Burger3Qty,
       SUM(CASE WHEN BurgerCode LIKE 'BurgerCode4' THEN 1 ELSE 0 END) AS Burger4Qty,
       SUM(CASE WHEN BurgerCode LIKE 'BurgerCode5' THEN 1 ELSE 0 END) AS Burger5Qty,
       SUM(CASE WHEN BurgerCode LIKE 'BurgerCode6' THEN 1 ELSE 0 END) AS Burger6Qty
    FROM TransactionOrders
    GROUP BY CustomerID
    )
    SELECT c.*, ct.Name CustomerName FROM cte c JOIN CustomerTable ct ON ct.CustomerID = c.CustomerID

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使用

pivot

可以发布示例数据吗？您使用什么来呈现数据？