SQL内部联接两列（是一列中的最小值）

Question

I am working on a project here where I have two tables, one with expiry dates named tracking and one with inventory data named inventoryreport. I need to gather the minimum expiry date from the tracking table as well as the quantity associated with it and update the inventoryreport table. The unique identifier in each table is the SKU number. So far this is what I have, I know it is is incomplete and I have tried min() on the tracking.expirydate I would appreciate any suggestions.

UPDATE InventoryReport
INNER JOIN tracking ON [InventoryReport].[SKU] = [tracking].[SKU]
SET [InventoryReport].[Expiry Date]  = [tracking].[Expiry Date], 
[InventoryReport].[Quantity] = [tracking].[Quantity];

Answer 1

If there exists nothing smaller than something, then it is the minimum, or in SQL:

UPDATE InventoryReport AS i
INNER JOIN tracking AS t ON t.[SKU] = i.[SKU] AND NOT EXISTS(
    SELECT t2.[Expiry Date]
    FROM tracking AS t2
    WHERE t2.[SKU] = t.[SKU] AND t2.[Expiry Date] < t.[Expiry Date]
) SET i.[Expiry Date] = t.[Expiry Date], 
      i.[Quantity] = t.[Quantity]
;