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SQL 長時間運行查詢/最大化服務器資源，例如 RAM/CPU

[英]SQL Long running query / maxing out server resource e.g. RAM/CPU

 原文  2018-10-17 13:50:29  6   1    sql/ sql-server/ database/ common-table-expression/ sqlperformance

問題描述

我最初發布了以下線程SQL 查詢 - 長時間運行/占用 CPU 資源

我的問題是我的查詢的 SARGABILITY，已經解決了這個問題（請參閱上一個線程，但簡而言之，我使用了很多繞過索引掃描的 ISNULL 函數）我現在遇到了更多問題。

我的 SQL 服務器設置如下：

並行性的成本閾值5

最大並行度0

我的查詢仍然需要 2:13 才能運行並導致 CPU/內存峰值，我有一個功能強大的服務器，例如 64GB RAM，因此資源不是問題。 請參閱下面的查詢：

WITH CTE AS 
(
    SELECT R.Id AS ResultId,
        r.JobId,
        r.CandidateId,
        R.Email,
        CAST(0 AS BIT) AS EmailSent,
        NULL AS EmailSentDate,
        'PICKUP' AS EmailStatus,
        GETDATE() AS CreateDate,
        C.Id AS UserId,
        C.Email AS UserEmail,
        NULL AS Subject
    FROM RESULTS R
    INNER JOIN JOB J ON R.JobId = J.Id
    INNER JOIN Consultant C ON J.UserId = C.Id
    WHERE 
        J.DCApproved = 1
        AND (J.Closed = 0 OR J.Closed IS NULL)
        AND (R.Email <> '' OR R.Email IS NOT NULL)
        AND (R.EmailSent = 0 OR R.EmailSent IS NULL)
        AND R.EmailSentDate IS NULL -- email has not been sent
        AND (R.EmailStatus = '' OR R.EmailStatus IS NULL)
        AND (R.IsEmailSubscribe = 'True' OR R.IsEmailSubscribe IS NULL)
        -- not already been emailed for this job
        AND NOT EXISTS (
            SELECT SMTP.Email
            FROM SMTP_Production SMTP
            WHERE SMTP.JobId = R.JobId AND SMTP.CandidateId = R.CandidateId
        )
        -- not unsubscribed
        AND NOT EXISTS (        
            SELECT u.Id FROM Unsubscribe u
            WHERE (u.EmailAddress = R.Email OR (u.EmailAddress IS NULL AND R.Email IS NULL)) 
        )
        AND NOT EXISTS (
            SELECT SMTP.Id FROM SMTP_Production SMTP
            WHERE SMTP.EmailStatus = 'PICKUP' AND SMTP.CandidateId = R.CandidateId
        )   
        AND C.Id NOT IN (
            -- LIST OF IDS
        )
        AND J.Id NOT IN (
            -- LIST OF IDS
        )
        AND J.ClientId NOT IN 
        (
            -- LIST OF IDS
        )
)

SELECT 
    CTE.ResultId,
    CTE.JobId,
    CTE.CandidateId,
    CTE.Email,
    CTE.EmailSent,
    CTE.EmailSentDate,
    CTE.EmailStatus,
    CTE.CreateDate,
    CTE.UserId,
    CTE.UserEmail,
    NULL
FROM CTE
  INNER JOIN 
    (
        SELECT *, row_number() over(partition by CTE.Email, CTE.CandidateId order by CTE.EmailSentDate desc) as rn
        FROM CTE

    ) DCTE ON CTE.ResultId = DCTE.ResultId AND DCTE.rn = 1

請參閱下面結果表的索引，下面的內容似乎不正確：

/****** Object:  Index [_dta_index_Results_7_2107154552__K35_K2_K3_K34_K36_K8_K33_K1]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [_dta_index_Results_7_2107154552__K35_K2_K3_K34_K36_K8_K33_K1] ON [dbo].[Results]
(
    [EmailSentDate] ASC,
    [JobId] ASC,
    [AryaCandidateId] ASC,
    [EmailSent] ASC,
    [EmailStatus] ASC,
    [Email] ASC,
    [IsEmailSubscribe] ASC,
    [Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [ACI_CMT_APPLICANTS]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [ACI_CMT_APPLICANTS] ON [dbo].[Results]
(
    [Email] ASC
)
INCLUDE (   [Id],
    [AryaCandidateId]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object:  Index [ACI_Job]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [ACI_Job] ON [dbo].[Results]
(
    [AryaCandidateId] ASC,
    [JobId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object:  Index [ACI_Results]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [ACI_Results] ON [dbo].[Results]
(
    [AryaCandidateId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [gen_smtp_auto]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [gen_smtp_auto] ON [dbo].[Results]
(
    [EmailSentDate] ASC,
    [Email] ASC,
    [IsEmailSubscribe] ASC,
    [EmailSent] ASC,
    [EmailStatus] ASC
)
INCLUDE (   [Id],
    [JobId],
    [AryaCandidateId]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [Hot]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [Hot] ON [dbo].[Results]
(
    [JobId] ASC,
    [Action] ASC
)
INCLUDE (   [Engaged]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object:  Index [IX_Results]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [IX_Results] ON [dbo].[Results]
(
    [Id] ASC,
    [JobId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object:  Index [IX_Results_1]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [IX_Results_1] ON [dbo].[Results]
(
    [Id] ASC,
    [JobId] ASC,
    [AryaCandidateId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [JobMetrics]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [JobMetrics] ON [dbo].[Results]
(
    [JobId] ASC,
    [Source] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [KEY_CAMPAIGN]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [KEY_CAMPAIGN] ON [dbo].[Results]
(
    [ResumeDownloadedDate] ASC,
    [ResumeDownloadStatus] ASC,
    [KeywordCampaignId] ASC,
    [Source] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object:  Index [MISSING_CREATEDATE]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [MISSING_CREATEDATE] ON [dbo].[Results]
(
    [CreateDate] ASC
)
INCLUDE (   [Id]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object:  Index [MISSING_MOVERSPROB]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [MISSING_MOVERSPROB] ON [dbo].[Results]
(
    [MoversProbability] ASC
)
INCLUDE (   [Id]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object:  Index [MISSING_SORTORDER]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [MISSING_SORTORDER] ON [dbo].[Results]
(
    [SortOrder] ASC
)
INCLUDE (   [Id]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [Proto_Resume_Downloa]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [Proto_Resume_Downloa] ON [dbo].[Results]
(
    [JobId] ASC,
    [ResumeDownloadedDate] ASC,
    [ResumeDownloadStatus] ASC,
    [Location] ASC,
    [Source] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [Result_Email]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [Result_Email] ON [dbo].[Results]
(
    [Email] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [Result_Email_Send]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [Result_Email_Send] ON [dbo].[Results]
(
    [EmailSentDate] ASC
)
INCLUDE (   [Id],
    [JobId],
    [AryaCandidateId],
    [Email],
    [IsEmailSubscribe],
    [EmailSent],
    [EmailStatus]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [Results_JobId_ACI_Email]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [Results_JobId_ACI_Email] ON [dbo].[Results]
(
    [JobId] ASC
)
INCLUDE (   [Id],
    [AryaCandidateId],
    [Email]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [RESULTS_JOBID_ALL]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [RESULTS_JOBID_ALL] ON [dbo].[Results]
(
    [JobId] ASC
)
INCLUDE (   [Id],
    [AryaCandidateId],
    [CandidateScore],
    [FirstName],
    [LastName],
    [Telephone],
    [Email],
    [AddressLine1],
    [Location],
    [Postcode],
    [Resume],
    [CurrentJob],
    [CurrentCompany],
    [Skills],
    [Experience],
    [Education],
    [AryaUpdateDate],
    [Industry],
    [Source],
    [LinkedIn],
    [Facebook],
    [Twitter],
    [MoversLabel],
    [MoversProbability],
    [SortOrder],
    [CreateDate],
    [ResumeId],
    [IsEmailSubscribe],
    [EmailSent],
    [EmailSentDate],
    [EmailStatus],
    [Registered],
    [HasVoyagerData],
    [Action],
    [Engaged],
    [FormattedCV],
    [CV],
    [DerivedSource],
    [VoyCode],
    [IsEmailEngaged],
    [IsSMSEngaged],
    [KeywordCampaignId]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [ResultsGetResultsbyConsultantId]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [ResultsGetResultsbyConsultantId] ON [dbo].[Results]
(
    [JobId] ASC
)
INCLUDE (   [Id],
    [AryaCandidateId],
    [CandidateScore],
    [FirstName],
    [LastName],
    [Telephone],
    [Email],
    [AddressLine1],
    [Location],
    [Postcode],
    [Resume],
    [CurrentJob],
    [CurrentCompany],
    [Skills],
    [Experience],
    [Education],
    [AryaUpdateDate],
    [Industry],
    [Source],
    [LinkedIn],
    [Facebook],
    [Twitter],
    [MoversLabel],
    [MoversProbability],
    [DOB],
    [SortOrder],
    [ResumeDownloaded],
    [ResumeDownloadedDate],
    [ResumeDownloadStatus],
    [CreateDate],
    [ResumeId],
    [IsEmailSubscribe],
    [EmailSent],
    [EmailSentDate],
    [EmailStatus],
    [Action],
    [Engaged],
    [SentToArya],
    [IgnoreEmailSent],
    [IgnoreEmailSentDate],
    [FormattedCV],
    [CV],
    [DerivedSource],
    [IsEmailEngaged],
    [IsSMSEngaged]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [Stats_Results_JOB_ACI_ACTION_ENGAGED]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [Stats_Results_JOB_ACI_ACTION_ENGAGED] ON [dbo].[Results]
(
    [JobId] ASC
)
INCLUDE (   [AryaCandidateId],
    [Action],
    [Engaged]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
/****** Object:  Index [Stats_Results_JobId_ACI]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [Stats_Results_JobId_ACI] ON [dbo].[Results]
(
    [JobId] ASC
)
INCLUDE (   [AryaCandidateId]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [Stats_Results_JobId_ACI_Action_Engaged]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [Stats_Results_JobId_ACI_Action_Engaged] ON [dbo].[Results]
(
    [JobId] ASC
)
INCLUDE (   [AryaCandidateId],
    [Action],
    [Engaged]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [Stats_Results_JobId_ACI_DERIVED]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [Stats_Results_JobId_ACI_DERIVED] ON [dbo].[Results]
(
    [JobId] ASC
)
INCLUDE (   [AryaCandidateId],
    [DerivedSource]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [Stats_Results_JobId_SOURCE_ACI]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [Stats_Results_JobId_SOURCE_ACI] ON [dbo].[Results]
(
    [JobId] ASC,
    [Source] ASC
)
INCLUDE (   [AryaCandidateId]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
SET ANSI_PADDING ON
GO
/****** Object:  Index [Stats_Results_JobId_Source_ACI_V2]    Script Date: 17/10/2018 15:06:18 ******/
CREATE NONCLUSTERED INDEX [Stats_Results_JobId_Source_ACI_V2] ON [dbo].[Results]
(
    [JobId] ASC,
    [Source] ASC
)
INCLUDE (   [AryaCandidateId]) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
ALTER TABLE [dbo].[Results] ADD  CONSTRAINT [DF_Results_CreateDate]  DEFAULT (getdate()) FOR [CreateDate]
GO

1 個解決方案

解決方案1
 1  2018-10-17 14:32:30

我有一些建議可以減少執行時間：

  1. 如果主記錄的電子郵件為空，則不需要運行子查詢：

所以而不是這個聲明：

AND NOT EXISTS (        
            SELECT u.Id FROM Unsubscribe u
            WHERE (u.EmailAddress = R.Email OR (u.EmailAddress IS NULL AND R.Email IS NULL)) 
        )

使用以下語句：

 AND (NOT EXISTS (        
            SELECT u.Id FROM Unsubscribe u
            WHERE u.EmailAddress = R.Email ) 
        ) or  R.Email IS NULL) -- you dont need to check is it is null
  1. 我建議您盡可能減少或使用符號，請嘗試使用 union 而不是 OR。 您可以在以下鏈接中找到一些示例：

SQL 性能 UNION 與 OR

  1. 據我了解，您可以使用 JOBID 來過濾 SMTP_Production 記錄，如果可以：

而不是這個聲明

 AND NOT EXISTS (
            SELECT SMTP.Id FROM SMTP_Production SMTP
            WHERE SMTP.EmailStatus = 'PICKUP' AND SMTP.CandidateId = R.CandidateId -- can we add SMTP.JobId = R.JobId
        )

你可以在下面使用

 AND NOT EXISTS (
            SELECT SMTP.Id FROM SMTP_Production SMTP
            WHERE SMTP.EmailStatus = 'PICKUP' AND SMTP.CandidateId = R.CandidateId and SMTP.JobId = R.JobId 
        )

查詢的最終版本可能是這樣的：

WITH CTE AS 
(
    SELECT R.Id AS ResultId,
        r.JobId,
        r.CandidateId,
        R.Email,
        CAST(0 AS BIT) AS EmailSent,
        NULL AS EmailSentDate,
        'PICKUP' AS EmailStatus,
        GETDATE() AS CreateDate,
        C.Id AS UserId,
        C.Email AS UserEmail,
        NULL AS Subject
    FROM RESULTS R
    INNER JOIN JOB J ON R.JobId = J.Id
    INNER JOIN Consultant C ON J.UserId = C.Id
    WHERE 
        J.DCApproved = 1
        AND (J.Closed <> 1)
        AND (R.Email <> '' OR R.Email IS NOT NULL)
        AND (R.EmailSent <> 1)
        AND R.EmailSentDate IS NULL -- email has not been sent
        AND (R.EmailStatus = '' OR R.EmailStatus IS NULL)
        AND (R.IsEmailSubscribe <> 'False')
        -- not already been emailed for this job
        AND NOT EXISTS (
            SELECT SMTP.Email
            FROM SMTP_Production SMTP
            WHERE SMTP.JobId = R.JobId AND SMTP.CandidateId = R.CandidateId
        )
        -- not unsubscribed
          AND ((NOT EXISTS (        
            SELECT u.Id FROM Unsubscribe u
            WHERE u.EmailAddress = R.Email ) 
        ) or  R.Email IS NULL) )
         AND NOT EXISTS (
            SELECT SMTP.Id FROM SMTP_Production SMTP
            WHERE SMTP.EmailStatus = 'PICKUP' AND SMTP.CandidateId = R.CandidateId and SMTP.JobId = R.JobId 
        ) 
        AND C.Id NOT IN (
            -- LIST OF IDS
        )
        AND J.Id NOT IN (
            -- LIST OF IDS
        )
        AND J.ClientId NOT IN 
        (
            -- LIST OF IDS
        )
)

SELECT 
    CTE.ResultId,
    CTE.JobId,
    CTE.CandidateId,
    CTE.Email,
    CTE.EmailSent,
    CTE.EmailSentDate,
    CTE.EmailStatus,
    CTE.CreateDate,
    CTE.UserId,
    CTE.UserEmail,
    NULL
FROM CTE
  INNER JOIN 
    (
        SELECT *, row_number() over(partition by CTE.Email, CTE.CandidateId order by CTE.EmailSentDate desc) as rn
        FROM CTE

    ) DCTE ON CTE.ResultId = DCTE.ResultId AND DCTE.rn = 1

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