SQL Left Join问题解决立马结帖

2017-07-16 12:26:07 515 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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SQL LEFT JOIN 详解 LEFT JOIN是一种 SQL 联接操作符，用于返回左表（Left Table）的所有记录，即使右表（Right Table）中没有匹配的记录。在结果集中，右表中的缺失值将用 NULL 表示。LEFT JOIN是一种非常有用的 SQL 联接操作符，可以帮助我们查询两个或多个表中的数据。在实际应用中，我们需要根据具体需求选择合适的 JOIN 类型，以确保查询结果的准确性。希望本文能帮助您更好地理解LEFT JOIN的概念和用法。本文共计 2000 字，旨在为读者提供关于LEFT JOIN的全面了解。阅读详情

EMR_ProcessUReadMessage表数据如下:一共6条
EMR_Code CreateByPlatform IsRead
201707130001 Doctor 1
201707130001 Desgin 0
201707130001 Medicine 1
201707130001 Doctor 1
201707130001 Desgin 0
201707130001 Medicine 1

doctor_essays 表两条记录:数据如下
EMR_Code doctorRemarkDate doctorRemark
201707130001 2017.07.14 14:19:00 添加一条未读信息
201707130001 2017.07.14 14:08:42 测试未读

simple_EMR表数据只有一条:
EMR_Code patient_Name patient_Age patient_Sex patient_Tel
201707130001 测试医学服务中心New 2017-08-16 1 15221105698

SQL语句如下:

 SELECT    dess.EMR_Code , H.isRead, 'Remark' as RecordType,H.CreateByPlatform,

                                                dess.doctorRemark AS 'message' ,

                                                dess.createDate 

                                                

                                      FROM      dbo.doctor_essays dess

                                               

                                                LEFT join dbo.simple_EMR  E on dess.EMR_Code=E.EMR_Code

                                                LEFT join  EMR_ProcessUReadMessage H on H.EMR_Code=dess.EMR_Code

                                      WHERE     dess.EMR_Code = '201707130001'  and   H.CreateByPlatform='Doctor'

                                                AND dess.flag = 1

查询出来的结果如下:
EMR_Code isRead RecordType CreateByPlatform message createDate
201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167
201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167
201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170
201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170

最终我想得到结果如下:请问各位高手如何实现??
EMR_Code isRead RecordType CreateByPlatform message createDate
201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167
201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170

...全文

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happy664618843

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切换为时间正序

happy664618843 2017-07-19

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顶有没有高手来啊

OwenZeng_DBA 2017-07-18

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你把这个SQL 拆分下吧，，join太多表，逻辑也复杂，如果数据量变大，性能也会存在隐患

happy664618843 2017-07-17

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引用 8 楼 sinat_28984567 的回复:

随便改了一个doctor是1的改成0 了

--测试数据
if not object_id(N'Tempdb..#EMR_ProcessUReadMessage') is null
    drop table #EMR_ProcessUReadMessage
Go
Create table #EMR_ProcessUReadMessage([EMR_Code] bigint,[CreateByPlatform] nvarchar(28),[IsRead] int)
Insert #EMR_ProcessUReadMessage
select 201707130001,N'Doctor',1 union all
select 201707130001,N'Desgin',0 union all
select 201707130001,N'Medicine',1 union all
select 201707130001,N'Doctor',0 union all
select 201707130001,N'Desgin',0 union all
select 201707130001,N'Medicine',1
GO
if not object_id(N'Tempdb..#doctor_essays') is null
    drop table #doctor_essays
Go
 CREATE TABLE #doctor_essays([EMR_Code] bigint,doctorRemarkDate DATETIME,doctorRemark NVARCHAR(100))
Insert #doctor_essays
select 201707130001,'2017.07.14 14:19:00',N'添加一条未读信息' union all
select 201707130001,'2017.07.14 14:08:42',N'测试未读'
GO
if not object_id(N'Tempdb..#simple_EMR') is null
    drop table #simple_EMR
Go
Create table #simple_EMR([EMR_Code] bigint,[patient_Name] nvarchar(31),[patient_Age] Date,[patient_Sex] bigint,[patient_Tel] bigint)
Insert #simple_EMR
select 201707130001,N'测试医学服务中心New','2017-08-16',1,15221105698
Go
--测试数据结束
;WITH ctea AS (
SELECT *,ROW_NUMBER()OVER(PARTITION BY [EMR_Code],[CreateByPlatform] ORDER BY (SELECT 1)) AS num FROM #EMR_ProcessUReadMessage
),cteb AS (
SELECT *,ROW_NUMBER()OVER(PARTITION BY [EMR_Code] ORDER BY doctorRemarkDate) AS num  FROM #doctor_essays
)
SELECT  dess.EMR_Code ,
        H.isRead ,
        'Remark' AS RecordType ,
        H.CreateByPlatform ,
        dess.doctorRemark AS 'message'
FROM    cteb dess
        LEFT JOIN #simple_EMR E ON dess.EMR_Code = E.EMR_Code
        LEFT JOIN ctea H ON H.EMR_Code = dess.EMR_Code AND H.num = dess.num
WHERE   dess.EMR_Code = '201707130001'
        AND H.CreateByPlatform = 'Doctor'

亲你好，谢谢，结果是对，我发帖的时候，SQL精简了，以下SQL如何改成我想要的结果？？

SELECT  distinct *
                            FROM    (
							
								 SELECT  e.patient_Name as patientName,e.patient_Sex as patientSex,e.patient_Tel as patientTel,   es.EMR_Code , H.isRead, 'Process' as RecordType,H.CreateByPlatform,
                                                es.message ,
                                                es.createDate ,
                                                CASE WHEN d.userRealName IS NULL
                                                          OR d.userRealName = ''
                                                     THEN CASE WHEN f.factoryName IS NULL
                                                                    OR f.factoryName = ''
                                                               THEN CASE WHEN der.userRealName IS NULL
                                                                              OR der.userRealName = ''
                                                                         THEN  es.Designer
                                                                    END
                                                               ELSE f.factoryName
                                                          END
                                                     ELSE d.userRealName
                                                END AS doctorName
                                      FROM      dbo.EMR_stream es
                                                LEFT JOIN dbo.doctors d ON d.Id = es.createId
                                                                           AND d.flag = 1
                                                LEFT JOIN dbo.factory f ON f.Id = es.createId
                                                                           AND f.flag = 1
                                                LEFT JOIN dbo.designers der ON der.Id = es.createId
                                                                               AND der.flag = 1
                                                LEFT join dbo.simple_EMR  E on es.EMR_Code=E.EMR_Code
                                                Left Join  EMR_ProcessUReadMessage H on H.EMR_Code=es.EMR_Code
                                      WHERE     es.EMR_Code = '201707130001'  and   H.CreateByPlatform='Doctor'
                                                AND es.flag = 1
                                      UNION
                                      SELECT   e.patient_Name,E.patient_Sex,e.patient_Tel, dess.EMR_Code , H.isRead, 'Remark' as RecordType,H.CreateByPlatform,
                                                dess.doctorRemark AS 'message' ,
                                                dess.createDate ,
                                                CASE WHEN d.userRealName IS NULL
                                                          OR d.userRealName = ''
                                                     THEN CASE WHEN der.userRealName IS NULL
                                                                    OR der.userRealName = '' THEN   isnull(dess.Designer,'作者') 
                                                               ELSE der.userRealName
                                                          END
                                                     ELSE d.userRealName
                                                END AS doctorName
                                      FROM      dbo.doctor_essays dess
                                                LEFT JOIN dbo.doctors d ON d.Id = dess.createId
                                                                           AND d.flag = 1
                                                LEFT JOIN dbo.designers der ON der.Id = dess.createId
                                                                               AND der.flag = 1
                                                LEFT join dbo.simple_EMR  E on dess.EMR_Code=E.EMR_Code
                                                LEFT join  EMR_ProcessUReadMessage H on H.EMR_Code=dess.EMR_Code
                                      WHERE     dess.EMR_Code = '201707130001'  and   H.CreateByPlatform='Doctor'
                                                AND dess.flag = 1
                                    ) a
                            ORDER BY a.createDate ASC

二月十六版主 2017-07-17

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随便改了一个doctor是1的改成0 了

--测试数据

if not object_id(N'Tempdb..#EMR_ProcessUReadMessage') is null

    drop table #EMR_ProcessUReadMessage

Go

Create table #EMR_ProcessUReadMessage([EMR_Code] bigint,[CreateByPlatform] nvarchar(28),[IsRead] int)

Insert #EMR_ProcessUReadMessage

select 201707130001,N'Doctor',1 union all

select 201707130001,N'Desgin',0 union all

select 201707130001,N'Medicine',1 union all

select 201707130001,N'Doctor',0 union all

select 201707130001,N'Desgin',0 union all

select 201707130001,N'Medicine',1

GO

if not object_id(N'Tempdb..#doctor_essays') is null

    drop table #doctor_essays

Go

 CREATE TABLE #doctor_essays([EMR_Code] bigint,doctorRemarkDate DATETIME,doctorRemark NVARCHAR(100))

Insert #doctor_essays

select 201707130001,'2017.07.14 14:19:00',N'添加一条未读信息' union all

select 201707130001,'2017.07.14 14:08:42',N'测试未读'

GO

if not object_id(N'Tempdb..#simple_EMR') is null

    drop table #simple_EMR

Go

Create table #simple_EMR([EMR_Code] bigint,[patient_Name] nvarchar(31),[patient_Age] Date,[patient_Sex] bigint,[patient_Tel] bigint)

Insert #simple_EMR

select 201707130001,N'测试医学服务中心New','2017-08-16',1,15221105698

Go

--测试数据结束

;WITH ctea AS (

SELECT *,ROW_NUMBER()OVER(PARTITION BY [EMR_Code],[CreateByPlatform] ORDER BY (SELECT 1)) AS num FROM #EMR_ProcessUReadMessage

),cteb AS (

SELECT *,ROW_NUMBER()OVER(PARTITION BY [EMR_Code] ORDER BY doctorRemarkDate) AS num  FROM #doctor_essays

)

SELECT  dess.EMR_Code ,

        H.isRead ,

        'Remark' AS RecordType ,

        H.CreateByPlatform ,

        dess.doctorRemark AS 'message'

FROM    cteb dess

        LEFT JOIN #simple_EMR E ON dess.EMR_Code = E.EMR_Code

        LEFT JOIN ctea H ON H.EMR_Code = dess.EMR_Code AND H.num = dess.num

WHERE   dess.EMR_Code = '201707130001'

        AND H.CreateByPlatform = 'Doctor'

happy664618843 2017-07-17

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引用 6 楼 sinat_28984567 的回复:

[quote=引用 5 楼 happy664618843 的回复:] 不是去重的问题，是我没有描述清楚，数据查询出来是这样的：查询出来的结果如下: EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 0 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 0 Remark Doctor 测试未读 2017-07-14 14:08:45.170 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170 最终我想得到结果如下:请问各位高手如何实现?? EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170

楼主我用你的测试数据和sql语句查询出来的美誉 10 10 这样的就是1111； EMR_ProcessUReadMessage 里边doctor的isread全是1没有0的[/quote] 你好，EMR_ProcessUReadMessage doctor的isRead字段有1 和0的，若全是1，我可以用distinct.之前是因为数据搞错了。

二月十六版主 2017-07-17

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引用 5 楼 happy664618843 的回复:

不是去重的问题，是我没有描述清楚，数据查询出来是这样的：查询出来的结果如下: EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 0 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 0 Remark Doctor 测试未读 2017-07-14 14:08:45.170 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170 最终我想得到结果如下:请问各位高手如何实现?? EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170

楼主我用你的测试数据和sql语句查询出来的美誉 10 10 这样的就是1111； EMR_ProcessUReadMessage 里边doctor的isread全是1没有0的

happy664618843 2017-07-17

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引用 3 楼 sinat_28984567 的回复:

--测试数据
if not object_id(N'Tempdb..#EMR_ProcessUReadMessage') is null
	drop table #EMR_ProcessUReadMessage
Go
Create table #EMR_ProcessUReadMessage([EMR_Code] bigint,[CreateByPlatform] nvarchar(28),[IsRead] int)
Insert #EMR_ProcessUReadMessage
select 201707130001,N'Doctor',1 union all
select 201707130001,N'Desgin',0 union all
select 201707130001,N'Medicine',1 union all
select 201707130001,N'Doctor',1 union all
select 201707130001,N'Desgin',0 union all
select 201707130001,N'Medicine',1
GO
if not object_id(N'Tempdb..#doctor_essays') is null
	drop table #doctor_essays
Go
 CREATE TABLE #doctor_essays([EMR_Code] bigint,doctorRemarkDate DATETIME,doctorRemark NVARCHAR(100))
Insert #doctor_essays
select 201707130001,'2017.07.14 14:19:00',N'添加一条未读信息' union all
select 201707130001,'2017.07.14 14:08:42',N'测试未读'
GO
if not object_id(N'Tempdb..#simple_EMR') is null
	drop table #simple_EMR
Go
Create table #simple_EMR([EMR_Code] bigint,[patient_Name] nvarchar(31),[patient_Age] Date,[patient_Sex] bigint,[patient_Tel] bigint)
Insert #simple_EMR
select 201707130001,N'测试医学服务中心New','2017-08-16',1,15221105698
Go
--测试数据结束
SELECT DISTINCT dess.EMR_Code ,
        H.IsRead ,
        'Remark' AS RecordType ,
        H.CreateByPlatform ,
        dess.doctorRemark AS 'message'
FROM    #doctor_essays dess
        LEFT JOIN #simple_EMR E ON dess.EMR_Code = E.EMR_Code
        LEFT JOIN #EMR_ProcessUReadMessage H ON H.EMR_Code = dess.EMR_Code
WHERE   dess.EMR_Code = '201707130001'
        AND H.CreateByPlatform = 'Doctor';

不是去重的问题，是我没有描述清楚，数据查询出来是这样的：查询出来的结果如下: EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 0 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 0 Remark Doctor 测试未读 2017-07-14 14:08:45.170 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170 最终我想得到结果如下:请问各位高手如何实现?? EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170

happy664618843 2017-07-17

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引用楼主 happy664618843 的回复:

EMR_ProcessUReadMessage表数据如下:一共6条 EMR_Code CreateByPlatform IsRead 201707130001 Doctor 1 201707130001 Desgin 0 201707130001 Medicine 1 201707130001 Doctor 1 201707130001 Desgin 0 201707130001 Medicine 1 doctor_essays 表两条记录:数据如下 EMR_Code doctorRemarkDate doctorRemark 201707130001 2017.07.14 14:19:00 添加一条未读信息 201707130001 2017.07.14 14:08:42 测试未读 simple_EMR表数据只有一条: EMR_Code patient_Name patient_Age patient_Sex patient_Tel 201707130001 测试医学服务中心New 2017-08-16 1 15221105698 SQL语句如下:
 SELECT    dess.EMR_Code , H.isRead, 'Remark' as RecordType,H.CreateByPlatform,
                                                dess.doctorRemark AS 'message' ,
                                                dess.createDate 
                                                
                                      FROM      dbo.doctor_essays dess
                                               
                                                LEFT join dbo.simple_EMR  E on dess.EMR_Code=E.EMR_Code
                                                LEFT join  EMR_ProcessUReadMessage H on H.EMR_Code=dess.EMR_Code
                                      WHERE     dess.EMR_Code = '201707130001'  and   H.CreateByPlatform='Doctor'
                                                AND dess.flag = 1
查询出来的结果如下: EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170 最终我想得到结果如下:请问各位高手如何实现?? EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170

[/quote] 不是去重的问题，是我没有描述清楚，数据查询出来是这样的：查询出来的结果如下: EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 0 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 0 Remark Doctor 测试未读 2017-07-14 14:08:45.170 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170 最终我想得到结果如下:请问各位高手如何实现?? EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170

二月十六版主 2017-07-16

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SELECT  DISTINCT
        dess.EMR_Code ,
        H.isRead ,
        'Remark' AS RecordType ,
        H.CreateByPlatform ,
        dess.doctorRemark AS 'message' ,
        dess.createDate
FROM    dbo.doctor_essays dess
        LEFT JOIN dbo.simple_EMR E ON dess.EMR_Code = E.EMR_Code
        LEFT JOIN EMR_ProcessUReadMessage H ON H.EMR_Code = dess.EMR_Code
WHERE   dess.EMR_Code = '201707130001'
        AND H.CreateByPlatform = 'Doctor'
        AND dess.flag = 1;

OwenZeng_DBA 2017-07-16

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引用楼主 happy664618843 的回复:

EMR_ProcessUReadMessage表数据如下:一共6条 EMR_Code CreateByPlatform IsRead 201707130001 Doctor 1 201707130001 Desgin 0 201707130001 Medicine 1 201707130001 Doctor 1 201707130001 Desgin 0 201707130001 Medicine 1 doctor_essays 表两条记录:数据如下 EMR_Code doctorRemarkDate doctorRemark 201707130001 2017.07.14 14:19:00 添加一条未读信息 201707130001 2017.07.14 14:08:42 测试未读 simple_EMR表数据只有一条: EMR_Code patient_Name patient_Age patient_Sex patient_Tel 201707130001 测试医学服务中心New 2017-08-16 1 15221105698 SQL语句如下:
 SELECT    dess.EMR_Code , H.isRead, 'Remark' as RecordType,H.CreateByPlatform,
                                                dess.doctorRemark AS 'message' ,
                                                dess.createDate 
                                                
                                      FROM      dbo.doctor_essays dess
                                               
                                                LEFT join dbo.simple_EMR  E on dess.EMR_Code=E.EMR_Code
                                                LEFT join  EMR_ProcessUReadMessage H on H.EMR_Code=dess.EMR_Code
                                      WHERE     dess.EMR_Code = '201707130001'  and   H.CreateByPlatform='Doctor'
                                                AND dess.flag = 1
查询出来的结果如下: EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170 最终我想得到结果如下:请问各位高手如何实现?? EMR_Code isRead RecordType CreateByPlatform message createDate 201707130001 1 Remark Doctor 添加一条未读信息 2017-07-14 14:19:04.167 201707130001 1 Remark Doctor 测试未读 2017-07-14 14:08:45.170

前面加个去重就可以 SELECT distinct dess.EMR_Code , H.isRead, 'Remark' as RecordType,H.CreateByPlatform, dess.doctorRemark AS 'message' , dess.createDate FROM dbo.doctor_essays dess LEFT join dbo.simple_EMR E on dess.EMR_Code=E.EMR_Code LEFT join EMR_ProcessUReadMessage H on H.EMR_Code=dess.EMR_Code WHERE dess.EMR_Code = '201707130001' and H.CreateByPlatform='Doctor' AND dess.flag = 1

二月十六版主 2017-07-16

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--测试数据

if not object_id(N'Tempdb..#EMR_ProcessUReadMessage') is null

	drop table #EMR_ProcessUReadMessage

Go

Create table #EMR_ProcessUReadMessage([EMR_Code] bigint,[CreateByPlatform] nvarchar(28),[IsRead] int)

Insert #EMR_ProcessUReadMessage

select 201707130001,N'Doctor',1 union all

select 201707130001,N'Desgin',0 union all

select 201707130001,N'Medicine',1 union all

select 201707130001,N'Doctor',1 union all

select 201707130001,N'Desgin',0 union all

select 201707130001,N'Medicine',1

GO

if not object_id(N'Tempdb..#doctor_essays') is null

	drop table #doctor_essays

Go

 CREATE TABLE #doctor_essays([EMR_Code] bigint,doctorRemarkDate DATETIME,doctorRemark NVARCHAR(100))

Insert #doctor_essays

select 201707130001,'2017.07.14 14:19:00',N'添加一条未读信息' union all

select 201707130001,'2017.07.14 14:08:42',N'测试未读'

GO

if not object_id(N'Tempdb..#simple_EMR') is null

	drop table #simple_EMR

Go

Create table #simple_EMR([EMR_Code] bigint,[patient_Name] nvarchar(31),[patient_Age] Date,[patient_Sex] bigint,[patient_Tel] bigint)

Insert #simple_EMR

select 201707130001,N'测试医学服务中心New','2017-08-16',1,15221105698

Go

--测试数据结束

SELECT DISTINCT dess.EMR_Code ,

        H.IsRead ,

        'Remark' AS RecordType ,

        H.CreateByPlatform ,

        dess.doctorRemark AS 'message'

FROM    #doctor_essays dess

        LEFT JOIN #simple_EMR E ON dess.EMR_Code = E.EMR_Code

        LEFT JOIN #EMR_ProcessUReadMessage H ON H.EMR_Code = dess.EMR_Code

WHERE   dess.EMR_Code = '201707130001'

        AND H.CreateByPlatform = 'Doctor';

SQL Left Join问题 解决立马结帖

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SQL Left Join问题解决立马结帖