需要加速这个 SQL 查询答案

【问题标题】：Need to speed up this SQL query需要加速这个 SQL 查询
【发布时间】：2013-06-22 01:47:29
【问题描述】：

我的查询结构如下：

SELECT DISTINCT (CO.CateringOrderId),
               CO.CateringOrderNumber,
               MC.FirstName + ' ' + MC.LastName AS "CustomerName",
               CO.EventDate AS EventDate,
               CO.IsCompleted,
               CO.IsVerified,
               MC.EmailId,
               CAT.OfficePhone,
               CAT.Mobile,
               CAT.Fax,
               CO.TotalInvoiceAmount,
               CO.BarterCharityId,
               (SELECT Sum (Amount)
                FROM Catering_Order_Payment_Trans
                WHERE CateringOrderId = CO.CateringOrderId) AS AmountReceived
 FROM Catering_Orders CO,
      Master_Customer MC,
      Customer_Address_Trans CAT,
      Catering_Order_Employee_Trans COET
WHERE  MC.CompanyId = @p_CompanyId
  AND (MC.CustomerId = @p_CustomerId OR @p_CustomerId = -1)
  AND (CO.CateringOrderNumber LIKE '%' + @p_CateringOrderNumber + '%')
  AND (CO.EventDate >= CONVERT (DATETIME, @p_FromDate) OR @p_FromDate = '')
  AND (CO.EventDate <= CONVERT (DATETIME, @p_ToDate) OR @p_ToDate = '')
  AND (CO.IsCompleted = @p_IsCompleted OR @p_IsCompleted = -1)
  AND (COET.EmployeeId = @p_CatererId OR @p_CatererId = -1)
  AND MC.CustomerId = CO.CustomerId
  AND MC.PersonalAddressId = CAT.CustomerAddressId
  AND (COET.CateringOrderId = CO.CateringOrderId
       OR CO.CateringOrderId NOT IN
          (SELECT CateringOrderId FROM Catering_Order_Employee_Trans))
  AND (CAT.Mobile like '%' + @p_ContactNumber + '%' ) 
  AND (CO.IsActive is null or CO.IsActive=1)
ORDER BY CO.CateringOrderId DESC

我认为SUM 子查询会减慢它的速度。请建议我如何加快速度。目前它的执行时间约为 7 - 10 秒。

【问题讨论】：

执行计划是什么样的？ SQL Server 应该能够将该查询去关联到左外连接。
请提供完整的查询示例。
@Devart 我已经更新了问题
那DISTINCT 隐藏了不正确的JOIN 条件吗？ COET.CateringOrderId = CO.CateringOrderId OR CO.CateringOrderId NOT IN ... 在我看来很可疑。也请考虑使用ANSI 92 JOIN 关键字。这样可以更轻松地查看您是否有任何无意的交叉连接。
@MartinSmith 谢谢让我看看

标签： sql sql-server subquery query-optimization

【解决方案1】：

试试这样的 -

SELECT DISTINCT 
    CO.CateringOrderId,
    CO.CateringOrderNumber,
    MC.FirstName + ' ' + MC.LastName AS CustomerName,
    CO.EventDate AS EventDate,
    CO.IsCompleted,
    CO.IsVerified,
    MC.EmailId,
    CAT.OfficePhone,
    CAT.Mobile,
    CAT.Fax,
    CO.TotalInvoiceAmount,
    CO.BarterCharityId,
    AmountReceived = (
        SELECT SUM(t.Amount)
        FROM dbo.Catering_Order_Payment_Trans t
        WHERE t.CateringOrderId = CO.CateringOrderId
    )
FROM (
    SELECT *
    FROM dbo.Catering_Orders
    WHERE ISNULL(IsActive, 1) = 1
        AND (IsCompleted = @p_IsCompleted OR @p_IsCompleted = -1)
        AND CateringOrderNumber LIKE '%' + @p_CateringOrderNumber + '%'
        AND EventDate BETWEEN 
            CONVERT(DATETIME, ISNULL(NULLIF(@p_FromDate, ''), '18000101'))
            AND 
            CONVERT(DATETIME, ISNULL(NULLIF(@p_ToDate, ''), '30000101'))
) CO
JOIN dbo.Master_Customer MC ON MC.CustomerId = CO.CustomerId
JOIN dbo.Customer_Address_Trans CAT ON MC.PersonalAddressId = CAT.CustomerAddressId
LEFT JOIN (
    SELECT *
    FROM dbo.Catering_Order_Employee_Trans
    WHERE EmployeeId = @p_CatererId 
        OR @p_CatererId = -1
) COET ON COET.CateringOrderId = CO.CateringOrderId
WHERE MC.CompanyId = @p_CompanyId
    AND (MC.CustomerId = @p_CustomerId OR @p_CustomerId = -1)
    AND CAT.Mobile LIKE '%' + @p_ContactNumber + '%'

主要问题

AND (COET.CateringOrderId = CO.CateringOrderId
       OR CO.CateringOrderId NOT IN
          (SELECT CateringOrderId FROM Catering_Order_Employee_Trans))

和

 (SELECT Sum (Amount)
                FROM Catering_Order_Payment_Trans
                WHERE CateringOrderId = CO.CateringOrderId) AS AmountReceived

【讨论】：

【解决方案2】：

试试：

SELECT CO.CateringOrderId,
       CO.CateringOrderNumber,
       MC.FirstName + ' ' + MC.LastName AS "CustomerName",
       CO.EventDate AS EventDate,
       CO.IsCompleted,
       CO.IsVerified,
       MC.EmailId,
       CAT.OfficePhone,
       CAT.Mobile,
       CAT.Fax,
       CO.TotalInvoiceAmount,
       CO.BarterCharityId,
       COPT.AmountReceived
FROM Catering_Orders CO
JOIN Master_Customer MC ON MC.CustomerId = CO.CustomerId
JOIN Customer_Address_Trans CAT ON MC.PersonalAddressId = CAT.CustomerAddressId
LEFT JOIN (SELECT CateringOrderId, Sum(Amount) AS AmountReceived
           FROM Catering_Order_Payment_Trans
           GROUP BY CateringOrderId) COPT
  ON COPT.CateringOrderId = CO.CateringOrderId
WHERE  MC.CompanyId = @p_CompanyId
  AND (MC.CustomerId = @p_CustomerId OR @p_CustomerId = -1)
  AND (CO.CateringOrderNumber LIKE '%' + @p_CateringOrderNumber + '%')
  AND (CO.EventDate >= CONVERT (DATETIME, @p_FromDate) OR @p_FromDate = '')
  AND (CO.EventDate <= CONVERT (DATETIME, @p_ToDate) OR @p_ToDate = '')
  AND (CO.IsCompleted = @p_IsCompleted OR @p_IsCompleted = -1)
  AND EXISTS
      (SELECT NULL 
       FROM Catering_Order_Employee_Trans COET 
       WHERE COET.CateringOrderId = CO.CateringOrderId AND 
             (COET.EmployeeId = @p_CatererId OR @p_CatererId = -1) )
  AND (CAT.Mobile like '%' + @p_ContactNumber + '%' ) 
  AND (CO.IsActive is null or CO.IsActive=1)
ORDER BY CO.CateringOrderId DESC

【讨论】：

【解决方案3】：

要优化您的查询，您应该编辑插入在 AND 条件中的 OR 条件，这确实会减慢您的查询速度

AND (   CO.EventDate <= CONVERT (DATETIME, @p_ToDate)
       OR @p_ToDate = '')

应该变成类似

 AND (   CO.EventDate <= CASE WHEN @p_ToDate = '' THEN 
                        GETDATE() 
                    ELSE 
                        CONVERT (DATETIME,@p_ToDate) 
                    END)

还尝试在 select 和 where 中逐一删除嵌套的 select 以查看哪个最会减慢查询速度

【讨论】：

谢谢..我可以用 SUM 子查询做什么？
您可以在join中添加该表，在select中您将直接进行求和，然后将group by子句与其他列一起添加