Question

我有以下视图，我需要在字符表中添加characterName列作为参考 ，不用 更改查询结果的结构。请帮忙。

        CREATE VIEW vwTopStackedItems
    AS
        SELECT TOP 20 MAX(inventorySlot.quantity) AS 'Top Stacked', item.itemName AS 'Item Name'
        FROM inventorySlot
        JOIN item
        ON inventorySlot.itemID = item.itemID
        JOIN character
        ON inventorySlot.characterID = character.characterID
        WHERE quantity > 1
        GROUP BY itemName
        ORDER BY MAX(quantity) DESC             
    GO


SELECT * FROM vwTopStackedItems
GO

Answer 1

您可以使用函数CONCAT（）来连接这两个值。有关详细信息：https://docs.microsoft.com/en-us/sql/t-sql/functions/concat-transact-sql

CREATE VIEW vwTopStackedItems
    AS
        SELECT TOP 20 MAX(inventorySlot.quantity) AS 'Top Stacked', CONCAT(item.itemName, '-', character.characterName)  AS 'Item Name'
        FROM inventorySlot
        JOIN item
        ON inventorySlot.itemID = item.itemID
        JOIN character
        ON inventorySlot.characterID = character.characterID
        WHERE quantity > 1
        GROUP BY CONCAT(item.itemName, '-', character.characterName)
        ORDER BY MAX(quantity) DESC             
    GO


SELECT * FROM vwTopStackedItems
GO

Answer 2

由于itemName是此视图的关键，因此您需要另一个视图：

CREATE VIEW vwTopStackedItemsWCharacter
    AS
        SELECT itemName, characterName 
        FROM inventorySlot
        JOIN item
        ON inventorySlot.itemID = item.itemID
        JOIN character
        ON inventorySlot.characterID = character.characterID
        GROUP BY itemName, characterName

第二个视图将带来角色名称，因此您将相应地加入。通过这种方式，您可以在vwTopStackedItems

上获得信息而无需任何更改

如何将列连接到T-SQL中的选定查询

2 个答案: