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SQL 长时间运行查询/最大化服务器资源，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

问题描述

我最初发布了以下线程SQL 查询 - 长时间运行/占用 CPU 资源

我的问题是我的查询的 SARGABILITY，已经解决了这个问题（请参阅上一个线程，但简而言之，我使用了很多绕过索引扫描的 ISNULL 函数）我现在遇到了更多问题。

我的 SQL 服务器设置如下：

并行性的成本阈值5

最大并行度0

我的查询仍然需要 2:13 才能运行并导致 CPU/内存峰值，我有一个功能强大的服务器，例如 64GB RAM，因此资源不是问题。 请参阅下面的查询：

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

请参阅下面结果表的索引，下面的内容似乎不正确：

/****** 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 个解决方案

解决方案1
 1  2018-10-17 14:32:30

我有一些建议可以减少执行时间：

  1. 如果主记录的电子邮件为空，则不需要运行子查询：

所以而不是这个声明：

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

使用以下语句：

 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. 我建议您尽可能减少或使用符号，请尝试使用 union 而不是 OR。 您可以在以下链接中找到一些示例：

SQL 性能 UNION 与 OR

  1. 据我了解，您可以使用 JOBID 来过滤 SMTP_Production 记录，如果可以：

而不是这个声明

 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 
        )

查询的最终版本可能是这样的：

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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