为什么这说没有连接谓词？

Question

我的执行计划发布在 PasteThePlan.com 上。在第二个嵌套循环警告没有联接谓词。我还是新手，所以我很困惑。那是因为我使用 CTE 来确定两个属性的值吗？这个演示表格用于更多的报告，我不想为这个非常独特的报告创建第二个。

这是查询：

WITH Accumulators AS
(
 SELECT DISTINCT AreaNum, SuperintendentNum, SuperName
   FROM FI.SLAnalysis
  WHERE SuperName LIKE '%ACCUM%'
)
SELECT
    slard.[IO]
  , slard.PhaseName             AS PhaseName
  , slard.JobNum              AS JobNum
--  , slard.JobName              AS JobName
  , CASE
   WHEN SUBSTRING(JobNum, 5, 2) IN ('05', '06')
    THEN ac.SuperintendentNum
   ELSE slard.SuperNum
     END                AS SuperNum
  , CASE
   WHEN SUBSTRING(JobNum, 5, 2) IN ('05', '06')
    THEN ac.SuperName
   ELSE slard.SuperName
     END                AS SuperName
  , slard.AreaNum              AS AreaNum
  , slard.AreaName             AS AreaName
  , fp.WeekEndDate             AS WeekEndDate

  -- WTD Metrics
  , slard.WeeklyRevenue            AS WTDRevenue
  , slard.WeeklyCost             AS WTDCost  
  , slard.WeeklyRevenue - slard.WeeklyCost       AS WTDGP
  , CASE
   WHEN slard.WeeklyRevenue = .01 THEN 0
   ELSE slard.WeeklyRevenue
     END                AS WTDRatio
  , slard.Weekly_PER             AS WTDGPPer
  , slard.WeeklyStandOvrheadAdmin          AS WTDOverAdmin
  , slard.WeeklyStandOvrheadEquip          AS WTDOverEquip
  , (slard.WeeklyRevenue
   -slard.WeeklyCost
   -slard.WeeklyStandOvrheadAdmin
   -slard.WeeklyStandOvrheadEquip)         AS WTDOHGP

  --MTD Metrics      
  , slard.MTDRevenue             AS MTDRevenue
  , slard.MTDCost              AS MTDCost
  , slard.MTDRevenue - MTDCost          AS MTD_GP
  , CASE 
   WHEN slard.MTDRevenue <= .05 AND slard.MTDRevenue > 0 THEN 0
   ELSE slard.MTDRevenue
     END                AS MTDRatio
  , CASE
   WHEN slard.MTDRevenue <> 0
    THEN CAST(slard.MTDCost / slard.MTDRevenue AS DECIMAL(18, 2))
   ELSE CAST(0.00 AS DECIMAL(18, 2))
     END                AS MTDGPPer
  , slard.MonthlyStandOvrheadAdmin         AS MTDOverAdmin
  , slard.MonthlyStandOvrheadEquip         AS MTDOverEquip
  , (slard.MTDRevenue
   -slard.MTDCost
   -slard.MonthlyStandOvrheadAdmin
   -slard.MonthlyStandOvrheadEquip)        AS MTDOHGP
  -- YTD Metrics
  , slard.YTDRevenue             AS YTDRevenue
  , slard.YTDCost              AS YTDCost
  , slard.YTDRevenue - YTDCost          AS YTD_GP
  , CASE
   WHEN slard.YTDRevenue <= .53 AND slard.YTDRevenue > 0 THEN 0
   ELSE slard.YTDRevenue
     END                 AS YTDRatio
  , slard.YTDStandOvrheadAdmin          AS YTDOverAdmin
  , slard.YTDStandOvrheadEquip          AS YTDOverEquip
  , (slard.YTDRevenue
   -slard.YTDCost
   -slard.YTDStandOvrheadAdmin
   -slard.YTDStandOvrheadEquip)         AS YTDOHGP
  FROM [DW].[FI].[SLAnalysisReportData] slard
 INNER JOIN Accumulators ac
   ON slard.AreaNum = ac.AreaNum
 INNER JOIN CORP.FiscalPeriod fp
  ON slard.FY = fp.FY
   AND slard.[Period] = fp.[Period]
WHERE slard.FY = 2018
 AND slard.[Period]  = 3
    AND slard.AreaNum IN ('40')
   AND NOT (    WeeklyRevenue = 0
            AND WeeklyCost = 0
            AND WeeklyStandOvrheadAdmin = 0
            AND WeeklyStandOvrheadEquip = 0
            AND MTDRevenue = 0
            AND MTDCost = 0
            AND MonthlyStandOvrheadAdmin = 0
            AND MonthlyStandOvrheadEquip = 0
            AND YTDRevenue = 0
            AND YTDCost = 0
            AND YTDStandOvrheadAdmin = 0
            AND YTDStandOvrheadEquip = 0
           )

Answer 1

它发生在这里是因为谓词slard.AreaNum IN ('40')被推送到嵌套循环连接操作的两端。

我有一篇关于同一件事的博客文章，但归结为您的 WHERE 子句与 JOIN 子句匹配ON slard.AreaNum = ac.AreaNum

在这些情况下，优化器可以将 SARGable 谓词推送到索引访问（查找或扫描），因为可以确保输出的值将匹配。

这称为隐式谓词，您可以在此处阅读有关它们的更多信息：

克雷格·弗里德曼

一些笨蛋

在这种情况下，您可以忽略警告。

希望这可以帮助！