Question

这是数据库架构：

[删除]

我将用以下查询描述我正在做的事情：

最内层查询：选择满足saleId条件的所有WHERE

中间查询：选择属于productId

的所有saleId

最外面的查询：SUM products.cost并选择vendors.name。

这是我提出的SQL查询：

SELECT vendors.name AS Company
, SUM(products.cost) AS Revenue
FROM
    products
    INNER JOIN sold_products
        ON (products.productId = sold_products.productId)
    INNER JOIN vendors
    ON (products.vendorId = vendors.vendorId)
            WHERE sold_products.productId IN (
                    SELECT sold_products.productId
                    FROM
                        sold_products
                    WHERE sold_products.saleId IN (
                            SELECT sales.saleId     
                            FROM
                                markets
                                INNER JOIN vendors
                                ON (markets.vendorId = vendors.vendorId)
                                INNER JOIN sales_campaign
                                ON (sales_campaign.marketId = markets.marketId)
                                INNER JOIN packet_headers
                                ON (sales_campaign.packetHeaderId = packet_headers.packetHeaderId)
                                INNER JOIN packet_details
                                ON (packet_details.packetHeaderId = packet_headers.packetHeaderId)
                                INNER JOIN sales
                                ON (sales.packetDetailsId = packet_details.packetDetailsId)
                            WHERE vendors.customerId=60
                            )
                    )
GROUP BY Company
ORDER BY Revenue DESC;

有关优化此功能的任何帮助吗？

Answer 1

由于您只是使用内部联接，因此通常会将查询简化为如下所示：

SELECT  ve.name     AS Company
,       SUM(pr.cost) AS Revenue
FROM    products        pr
,       sold_products   sp
,       vendors         ve
,       markets         ma
,       sales_campaign  sc
,       packet_headers  ph
,       packet_details  pd
,       sales           sa
Where pr.productId = sp.productId
And   pr.vendorId  = ve.vendorId
And   ve.vendorId  = ma.vendorId
And   sc.marketId = ma.marketId
And   sc.packetHeaderId = ph.packetHeaderId
And   pd.packetHeaderId = ph.packetHeaderId)
And   sa.packetDetailsId = pd.packetDetailsId
And   ve.customerId = 60
GROUP BY ve.Company
ORDER BY pr.Revenue DESC;

请尝试这是否有效，如果速度更快，请告诉我。

如何优化此嵌套SQL查询

1 个答案: