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我构建了一个查询，该查询使用一组典型的标题/详细信息表来报告标题表中的记录，但提供来自详细表上各种类型的每个标题记录的聚合数据。

为了解决分组问题，我创建了一个视图来加入基于发票键的所有聚合。

CREATE OR REPLACE VIEW TransactDetailSummary_V AS
  SELECT
td.invoice
, SUM(CASE WHEN td.TaxCollected1 + td.TaxCollected2 + td.TaxCollected3 <> 0 AND td.Type NOT IN (9,13) THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) as taxable_sales
, SUM(CASE WHEN td.TaxCollected1 + td.TaxCollected2 + td.TaxCollected3 = 0 AND td.Type NOT IN (9,13) THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) as nontaxable_sales
, SUM(CASE WHEN td.Type IN (8,18) THEN td.Amount ELSE 0 END) as total_taxes
, SUM(CASE WHEN td.Type IN (15,16,26) THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) AS returns
, SUM(CASE WHEN td.Type IN (24) THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) AS trade_ins
, SUM(CASE WHEN td.Type IN (9,13,22) THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) AS payments
, SUM(CASE WHEN td.Type = 2 THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) as part_sales
, SUM(CASE WHEN td.Type = 3 THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) as serial_sales
, SUM(CASE WHEN td.Type = 15 THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) as part_returns
, SUM(CASE WHEN td.Type = 16 THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) as serial_returns
, SUM(CASE WHEN td.Type = 10 THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) as misc_charges
, SUM(CASE WHEN td.Type = 6 THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) as labor_charges
, SUM(CASE WHEN td.Type IN (4,5,11) THEN ROUND(td.Quantity * td.Amount, 2) ELSE 0 END) as rental_sales
FROM transactdetail td
GROUP BY td.Invoice;

然后在报告查询中，我使用发票键加入详细信息视图。

SELECT
  'Customer Invoices COMPLETED' as section_title
  , CAST(th.Invoice as UNSIGNED) as Invoice
  , th.DateInvoice as invoice_date
  , th.DateApply as completed_date
  , th.orderstatus as status
  , th.customername as customer_name
  , tdv.taxable_sales
  , tdv.nontaxable_sales
  , tdv.total_taxes
  , tdv.returns
  , tdv.trade_ins
  , tdv.payments
  , tdv.part_sales
  , tdv.serial_sales
  , tdv.part_returns
  , tdv.serial_returns
  , tdv.misc_charges
  , tdv.labor_charges
  , tdv.rental_sales
FROM transactheader th
JOIN TransactDetailSummary_V tdv ON tdv.Invoice = th.Invoice
WHERE th.DateApply BETWEEN '2013-04-15' AND '2013-04-15'
  AND th.OrderStatus IN ('Complete','Backorder')
  AND th.Type = 1
  AND th.Created = 'invoice'
ORDER BY 1;

在这个例子中，我用聚合数据返回了 13 个标题记录，太棒了！但我开始深入研究引擎做了多少工作，我发现了一些令人吃惊的东西。

id  select_type table   type    possible_keys   key key_len ref rows    Extra
1   PRIMARY <derived2>  ALL                 75609   
1   PRIMARY th  ref Invoice_Key,Type_Key,Status_Key Invoice_Key 20  tdv.invoice,const   10  Using where
2   DERIVED td  ALL                 350477  Using temporary; Using filesort

解释表明，正在读取详细信息表中的每一行，以提供我关心的 13 个标题的聚合。我知道视图正在具体化，然后根据连接进行过滤。

问题是，有没有办法让它只读取我关心的 13 张发票的详细信息？除非我可以关联它，否则我对连接的子查询进行成像会以相同的方式工作吗？

提前感谢您的帮助。

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