在几秒钟内从多个表中检索大量数据

Question

以下查询从多个表中检索数据。

有一个问题，随着数据的增加，检索数据的时间也增加了（行数已经达到2万，显示结果需要一分钟多）。

我使用了存储过程，但结果是一样的。有什么解决办法吗？

Select TransactionDate,
    T.InvoiceNo,
    T.TotalAmount,
    PCost.TotalCostPrice ,
    (T.TotalAmount - PCost.TotalCostPrice) as TProfit,
    P.PaidAmount, P.Balance,
    CONCAT(Lastname, ', ', Firstname, ' ', Middlename) as Cashier,
    ISNULL(P.DiscountAmount,0),
    ISNULL(P.ProfitAmount,0),
    CustomerInfo
FROM [Transaction] T 
INNER JOIN TransactionPayment P ON T.InvoiceNo = P.InvoiceNo 
INNER JOIN Employee E ON T.EmployeeID =  E.EmployeeID 
LEFT OUTER JOIN (
                SELECT  SUM(p.CostPrice*tl.Quantity) as TotalCostPrice,
                        tl.InvoiceNo 
                FROM Product p 
                INNER JOIN TransactionLineItem   tl ON p.ProductID = tl.ProductID 
                INNER JOIN [Transaction] T ON T.InvoiceNo = tl.InvoiceNo 
                WHERE TransactionDate >= @DateFrom AND TransactionDate <= @DateTo 
                GROUP BY tl.InvoiceNo
            )   as PCost ON PCost.InvoiceNo = T.InvoiceNo 
WHERE TransactionDate >= @DateFrom AND TransactionDate <= @DateTo

Answer 1

试试这个：

create index IX_Transaction_TransactionDate
on dbo.[Transaction] (TransactionDate, InvoiceNo);