mysql - 由于版本错误，如何在不使用 CTE 的情况下重写 MySQL CTE 查询？

Question

我的 CTE 出现错误。我在 Amazon RDS 上托管数据库。我的计算机上有另一个示例数据库主机 (localhost)。 CTE 在我的本地计算机上运行良好。我认为 Amazon RDS 有问题。也许它不支持 CTE。有人遇到同样的问题吗？知道如何解决此问题或如何在没有 CTE 的情况下重写此查询？对此的任何帮助将不胜感激。

    WITH StoreSku AS
(
    SELECT 
        S.StoreName
        ,  RTRIM(LTRIM(LEFT(S.StoreName, 4))) 'StoreNumber'
        , P.Sku
        , P.Description
    FROM simplymac_staging.LocationMasterList S
    CROSS JOIN simplymac_staging.`dbo.Sku` P
    WHERE S.Disabled = 0
),
Inventory AS
(
    SELECT 
        I.StoreName
        , RTRIM(LTRIM(LEFT(I.StoreName, 4))) 'StoreNumber'
        , I. ProductName
        , I.ProductIdentifier
        , I.UnitCost
        , SUM(I.Quantity) 'Quantity'
        , I.BinStatus
    FROM simplymac_staging.inventorylistinstores I
    GROUP BY 
          I.ProductIdentifier
        , I.ProductName
        , I.BinStatus
        , I.StoreName
        , I.UnitCost
)
SELECT 
      P.StoreName
    , P.Description
    , P.Sku
    , CASE WHEN I.BinStatus in ('String_InStock') THEN I.Quantity ELSE 0 END ' In Stock'
    , CASE WHEN I.BinStatus in ('String_TransferIn') THEN I.Quantity ELSE 0 END 'TransferIn'
    , CASE WHEN I.BinStatus in ('String_TransferOut') THEN I.Quantity ELSE 0 END 'TransferOut'
    , CASE WHEN I.BinStatus in ('String_OnOrder') THEN I.Quantity ELSE 0 END 'OnOrder'
FROM StoreSku P
LEFT JOIN  Inventory I ON I.ProductIdentifier = P.ID AND I.StoreNumber = P.StoreNumber

错误

Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Stores AS ( SELECT S.StoreName , RTRIM(LTRIM(LEFT(S.StoreName, 4))) 'St' at line 1

再次强调，如果能在没有 CTE 的情况下重写我的查询，我们将不胜感激。非常感谢你

Answer 1

作为一个简单的解决方案:由于两个 CTE 显然彼此无关，因此不涉及递归，并且每个 CTE 在主查询中仅从中选择一次，那么您可以将它们转换为内联表，即移动它们到 FROM 子句，像这样:

SELECT 
      P.StoreName
    , P.Description
    , P.Sku
    , CASE WHEN I.BinStatus in ('String_InStock') THEN I.Quantity ELSE 0 END ' In Stock'
    , CASE WHEN I.BinStatus in ('String_TransferIn') THEN I.Quantity ELSE 0 END 'TransferIn'
    , CASE WHEN I.BinStatus in ('String_TransferOut') THEN I.Quantity ELSE 0 END 'TransferOut'
    , CASE WHEN I.BinStatus in ('String_OnOrder') THEN I.Quantity ELSE 0 END 'OnOrder'
FROM 
(
    SELECT 
        S.StoreName
        ,  RTRIM(LTRIM(LEFT(S.StoreName, 4))) 'StoreNumber'
        , P.Sku
        , P.Description
    FROM simplymac_staging.LocationMasterList S
    CROSS JOIN simplymac_staging.`dbo.Sku` P
    WHERE S.Disabled = 0
) P
LEFT JOIN (
(
    SELECT 
        I.StoreName
        , RTRIM(LTRIM(LEFT(I.StoreName, 4))) 'StoreNumber'
        , I. ProductName
        , I.ProductIdentifier
        , I.UnitCost
        , SUM(I.Quantity) 'Quantity'
        , I.BinStatus
    FROM simplymac_staging.inventorylistinstores I
    GROUP BY 
          I.ProductIdentifier
        , I.ProductName
        , I.BinStatus
        , I.StoreName
        , I.UnitCost
) I ON I.ProductIdentifier = P.ID AND I.StoreNumber = P.StoreNumber