SQL长时间运行的查询/最大化服务器资源，例如内存/ CPU

时间：2018-10-17 13:50:30

标签： sql sql-server database common-table-expression sqlperformance

我最初发布了以下线程SQL Query - long running / taking up CPU resource

我的问题是查询的可维护性，已经解决了这个问题（请参见上一个线程，但简而言之，我使用了很多ISNULL函数，这些函数绕过了索引扫描）

我的SQL Server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

请参见下面“结果”表的索引，以下内容似乎不正确：

/****** 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 个答案:

答案 0 :(得分：1)

我为您提供一些减少执行时间的建议：

  1. 如果主记录的电子邮件为空，则无需运行子查询：

所以代替此语句：

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. 我建议您尽量减少或减少符号，请尝试使用并集而不是OR。您可以在下面的链接中找到一些示例：

SQL Performance UNION vs OR

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

代替此声明

 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
        )

您可以在下面使用

 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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