SQL 具有多个条件的 Server 2014 查询

Question

我有一个具有多个条件的 SQL 查询，对于给定的源（下面列出）我需要将结果集设置为具有以下条件的最终（下面列出）：

条件01：对于活动站点，应以“RO”作为联系人角色进行联系
条件 02：对于非活动站点，应以“所有者”作为联系人角色联系
条件03：如果活动站点没有以“RO”作为联系人角色的联系人，则应以'Owner'作为联系人角色进行联系人
条件 04：如果非活动站点没有以“所有者”作为联系人角色进行联系，则应以 'RO' 作为联系人角色进行联系
条件 05：如果活动 site/inactive 没有与“RO”或“所有者”作为联系人角色联系，则应与“操作员”作为联系人角色联系
条件 06：仅适用于活动站点避免 'XYZ' 联系 'RO' 作为联系角色并选择另一个联系 'RO' 作为联系角色，如果站点没有 'RO' 然后选择 'Owner' 或 'operator' 作为联系人角色
条件 07：如果网站 (active/inactive) 没有任何联系人，那么这些网站的联系人字段中应该有 'NULL' 值。

原始数据集记录超过 20K，我们能否将上述所有条件包含在一个查询中（如果可能，不使用子查询）？

Source 
======

Site_Status Site_id  Site_Contact  Contact Role 
Active      123      Lilly         Owner
Active      123      Elan          RO
Inactive    345      Rose          Owner
Inactive    345      Jack          RO
Active      678      Robert        Owner 
Inactive    912      Linda         RO
Active      234      Nike          Operator 
Inactive    456      Frank         Operator
Active      808      XYZ           RO
Active      808      Kelly         Owner
Active      999      XYZ           RO
Active      999      Debbi         Operator 
Active      122                
Inactive    188              


Final
======
Site_Status Site_id Site_Contact    ContactRole
Active      123     Elan            RO
Inactive    345     Rose            Owner
Active      678     Robert          Owner
Inactive    912     Linda           RO
Active      234     Nick            Operator
Inactive    456     Frank           Operator
Active      808     Kelly           Owner
Active      999     Debbi           Operator 
Active      122     NULL            NULL
Inactive    188     NULL            NULL

提前致谢！

Answer 1

类似这样...使用 window 函数和条件排序。

declare @YourTable table (Site_Status varchar(64), Site_id int, Site_Contact varchar(64), ContactRole varchar(64))
insert into @YourTable
values
('Active',123,'Lilly','Owner'),
('Active',123,'Elan','RO'),
('Inactive',345,'Rose','Owner'),
('Inactive',345,'Jack','RO'),
('Active',678,'Robert','Owner'),
('Inactive',912,'Linda','RO'),
('Active',234,'Nick','Operator'),
('Inactive',456,'Frank','Operator')

select
    t.*
from @YourTable t
inner join
    (select 
        Site_id
        ,Site_Status
        ,ContactRole
        ,Active = row_number() over (partition by Site_id, Site_Status order by case 
                                                                                    when Site_Status = 'Active' and ContactRole = 'RO' then 1
                                                                                    when Site_Status = 'Active' and ContactRole = 'Owner' then 2
                                                                                    when Site_Status = 'Active' and ContactRole = 'Operator' then 3
                                                                                end)
        ,InActive = row_number() over (partition by Site_id, Site_Status order by case
                                                                                    when Site_Status = 'InActive' and ContactRole = 'Owner' then 1
                                                                                    when Site_Status = 'InActive' and ContactRole = 'RO' then 2
                                                                                    when Site_Status = 'InActive' and ContactRole = 'Operator' then 3
                                                                                end)
    from @YourTable) x on 
    x.Site_id = t.Site_id 
    and x.Site_Status =  t.Site_Status 
    and t.ContactRole = x.ContactRole 
    and Active = 1 
    and InActive = 1

Answer 2

您可以使用 table 变量并逐渐填充它，但它不会是单个查询（它是存储过程的 ggod 候选者）。可以使用 union（相当大的一个）创建带有子查询的单个查询：

select * from [Source]
where [Contact Role] = 'RO' and Site_Status = 'Active'
union
select * from [Source]
where [Contact Role] = 'Owner' and Site_Status = 'Inactive'
union
select * from [Source] s1
where [Contact Role] = 'Owner' and Site_Status = 'Active'
and not exists(
    select 1 from [Source] s2 where s1.Site_Id = s2.Site_id 
    and s2.Site_Status = 'Active' and s2.[Contact Role] = 'RO'
)
union
select * from [Source] s1
where [Contact Role] = 'RO' and Site_Status = 'Inactive'
and not exists(
    select 1 from [Source] s2 where s1.Site_Id = s2.Site_id 
    and s2.Site_Status = 'Inactive' and s2.[Contact Role] = 'Owner'
)
union
select * from [Source] s1
where [Contact Role] = 'Operator'
and not exists(
    select 1 from [Source] s2 where s1.Site_Id = s2.Site_id 
    and (s2.[Contact Role] = 'Owner' or s2.[Contact Role] = 'RO')
)

SQL 具有多个条件的 Server 2014 查询

SQL Server 2014 query with multiple conditions

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