Question

我目前有一个SQL查询，用于为我们的公司创建事项报告。目前的问题是，它为客户/派对细节创建了六列，可以减少到三列，以最大限度地减少在报告用于营销之前将要审查的秘书的混淆。

有三种客户类型 - 个人，联合政党或组织。报告中的六列是ClientFirstName，ClientLastName，ClientEmail（如果ClientType为Individual，则全部填充）和PartyFirstName，PartyLastName，PartyEmail（如果ClientType是联合部分或组织，则全部填充 - 有时每个成员有多个结果））。

以下是查询：

SELECT DISTINCT
-- setup columns
[cases].[reference] as MatterNumber,
[dd_entity_d2].[type] as ClientType,
[dd_client].[clientname] as MatterName,
etClient.FirstName as ClientFirstName,
etClient.LastName as ClientLastName,
[dd_entity_d2].[email] as ClientEmail,
[dd_entity_d4].[firstname] as PartyFirstName,
[dd_entity_d4].[lastname] as PartyLastName,
[dd_entity_d4].[email] as PartyEmail,
etActing.[PreferredName] ActingPerson,
[cases].[category] as MatterType,
mt.CreatedOn as MatterOpened,
case mt.[Status]
    when 0 then 'In Progress'
    When 1 then 'On Hold'
    when 2 then 'Completed'
    when 3 then 'Not Proceeding'
else 'Unknown' end as MatterStatus
-- mt.LastUpdatedOn as LastModified,
-- end columns
-- setup data
FROM PracticeEvolve_doc.dbo.[cases]
INNER JOIN PracticeEvolve_c1.dbo.DocumaticsMap dm on dm.DocumaticsID = [cases].ID and dm.Entitytype = 'Matter'
INNER JOIN PracticeEvolve_c1.dbo.[Matter] mt on mt.Matterid = dm.ClickOneID
INNER JOIN PracticeEvolve_c1.dbo.[Client] cl on mt.ClientID = cl.ClientID
INNER JOIN PracticeEvolve_c1.dbo.[Entity] etClient on cl.EntityID = etClient.EntityID
LEFT JOIN PracticeEvolve_c1.dbo.EmployeeMatter emActing on emActing.MatterID = mt.MatterID and emActing.AssociationTypeID = 15
LEFT JOIN PracticeEvolve_c1.dbo.Employee eActing on eActing.EmployeeID = emActing.EmployeeID
LEFT JOIN PracticeEvolve_c1.dbo.Entity etActing on etActing.EntityID = eActing.EntityID
LEFT JOIN PracticeEvolve_doc.dbo.[dd_client] ON [dd_client].[id]=[cases].[clientid]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_manytomany] AS [dd_manytomanydd_entity_d2] ON [dd_manytomanydd_entity_d2].[fkid] = [dd_client].[fk_entities]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_entity] as [dd_entity_d2] ON [dd_entity_d2].[id] = [dd_manytomanydd_entity_d2].[pkid]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_manytomany] AS [dd_manytomanydd_party_d3] ON [dd_manytomanydd_party_d3].[fkid] = [dd_entity_d2].[fk_parties]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_party] as [dd_party_d3] ON [dd_party_d3].[id] = [dd_manytomanydd_party_d3].[pkid]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_manytomany] AS [dd_manytomanydd_entity_d4] ON [dd_manytomanydd_entity_d4].[fkid] = [dd_party_d3].[fk_entity]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_entity] as [dd_entity_d4] ON [dd_entity_d4].[id] = [dd_manytomanydd_entity_d4].[pkid]
-- end data
-- setup filters
WHERE [cases].[deleted]=0   
    AND DATEPART(m, mt.CreatedOn) = DATEPART(m, DATEADD(m, -1, getdate()))
    AND DATEPART(yyyy, mt.CreatedOn) = DATEPART(yyyy, DATEADD(m, -1, getdate())) 
    -- AND mt.CreatedOn >= '2017-05-16'   
    -- AND [dd_entity_d2].[type] = 'Individual'
    -- AND mt.LastUpdatedOn >= '2017-04-02'   
    -- AND mt.[status] = 0
-- end filters and query

我想要做的是让它只使用FirstName，LastName和Email列，以便在ClientType是个人的时候填充个人的详细信息，或填充联合方＆＃ 39; s /组织的详细信息，如果ClientType不是Individual。

这可能吗？

（作为一个免责声明 - 我是一个有数据库查询的新手，所以可能不知道如何实现特定的语句或字符串）

Answer 1

您可以使用案例陈述。我假设客户类型存储为文本但您可以更改个人＆＃39;适当的价值。

SELECT DISTINCT
-- setup columns
[cases].[reference] as MatterNumber,
[dd_entity_d2].[type] as ClientType,
[dd_client].[clientname] as MatterName,
CASE WHEN [dd_entity_d2].[type] ='Individual' THEN etClient.FirstName ELSE [dd_entity_d4].[firstname] END AS FirstName,
CASE WHEN [dd_entity_d2].[type] ='Individual' THEN etClient.LastName   ELSE [dd_entity_d4].[lastname] END AS LastName,
CASE WHEN [dd_entity_d2].[type] ='Individual' THEN [dd_entity_d2].[email]   ELSE [dd_entity_d4].[email] END AS Email,
etActing.[PreferredName] ActingPerson,
[cases].[category] as MatterType,
mt.CreatedOn as MatterOpened,
case mt.[Status]
    when 0 then 'In Progress'
    When 1 then 'On Hold'
    when 2 then 'Completed'
    when 3 then 'Not Proceeding'
else 'Unknown' end as MatterStatus
-- mt.LastUpdatedOn as LastModified,
-- end columns
-- setup data
FROM PracticeEvolve_doc.dbo.[cases]
INNER JOIN PracticeEvolve_c1.dbo.DocumaticsMap dm on dm.DocumaticsID = [cases].ID and dm.Entitytype = 'Matter'
INNER JOIN PracticeEvolve_c1.dbo.[Matter] mt on mt.Matterid = dm.ClickOneID
INNER JOIN PracticeEvolve_c1.dbo.[Client] cl on mt.ClientID = cl.ClientID
INNER JOIN PracticeEvolve_c1.dbo.[Entity] etClient on cl.EntityID = etClient.EntityID
LEFT JOIN PracticeEvolve_c1.dbo.EmployeeMatter emActing on emActing.MatterID = mt.MatterID and emActing.AssociationTypeID = 15
LEFT JOIN PracticeEvolve_c1.dbo.Employee eActing on eActing.EmployeeID = emActing.EmployeeID
LEFT JOIN PracticeEvolve_c1.dbo.Entity etActing on etActing.EntityID = eActing.EntityID
LEFT JOIN PracticeEvolve_doc.dbo.[dd_client] ON [dd_client].[id]=[cases].[clientid]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_manytomany] AS [dd_manytomanydd_entity_d2] ON [dd_manytomanydd_entity_d2].[fkid] = [dd_client].[fk_entities]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_entity] as [dd_entity_d2] ON [dd_entity_d2].[id] = [dd_manytomanydd_entity_d2].[pkid]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_manytomany] AS [dd_manytomanydd_party_d3] ON [dd_manytomanydd_party_d3].[fkid] = [dd_entity_d2].[fk_parties]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_party] as [dd_party_d3] ON [dd_party_d3].[id] = [dd_manytomanydd_party_d3].[pkid]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_manytomany] AS [dd_manytomanydd_entity_d4] ON [dd_manytomanydd_entity_d4].[fkid] = [dd_party_d3].[fk_entity]
LEFT JOIN PracticeEvolve_doc.dbo.[dd_entity] as [dd_entity_d4] ON [dd_entity_d4].[id] = [dd_manytomanydd_entity_d4].[pkid]
-- end data
-- setup filters
WHERE [cases].[deleted]=0   
    AND DATEPART(m, mt.CreatedOn) = DATEPART(m, DATEADD(m, -1, getdate()))
    AND DATEPART(yyyy, mt.CreatedOn) = DATEPART(yyyy, DATEADD(m, -1, getdate())) 
    -- AND mt.CreatedOn >= '2017-05-16'   
    -- AND [dd_entity_d2].[type] = 'Individual'
    -- AND mt.LastUpdatedOn >= '2017-04-02'   
    -- AND mt.[status] = 0
-- end filters and query

IF，然后，在SQL查询中结合多个列

1 个答案: