sql 服务器中的 UNPIVOT 没有聚合

Question

我有一个 Table 如下。

OfficeID    SunFrom SunTo   MonFrom MonTo   TueFrom TueTo   WedFrom WedTo   ThuFrom ThuTo   FriFrom FriTo   SatFrom SatTo
51834       12      17      8       22      8       22      8       22      8       22      9       21      8       19

我需要将此 table 的列转换为行

预期输出：

Officeid    Day         Daystart    DayEnd

51834       Sunday      12          17
51834       Monday      8           22
51834       Tuesday     8           22
51834       Wednesday   8           22
51834       Thursday    8           22
51834       Friday      9           21
51834       Saturday    8           19

我尝试使用 UNPIVOT，但我不确定我需要选择哪一列作为 pivot column。请帮忙....

Answer 1

这就是大部分内容。如果您想要特定的输出顺序，我建议使用辅助 table 将 3 个字符的日期名称映射到排序索引（以及全长名称，如果需要的话）：

declare @t table (OfficeID int,SunFrom  int,SunTo int,MonFrom int,MonTo int,
TueFrom int,TueTo int,WedFrom int,WedTo int,
ThuFrom int,ThuTo int,FriFrom int,FriTo int,
SatFrom int,SatTo int)
insert into @t(OfficeID,SunFrom,SunTo,MonFrom,MonTo,TueFrom,TueTo,
WedFrom,WedTo,ThuFrom,ThuTo,FriFrom,FriTo,SatFrom,SatTo) values
(51834,12,17,8,22,8,22,8,22,8,22,9,21,8,19)

select
    OfficeID,Day,
        MAX(CASE WHEN Endpoint='From' THEN EndpointTime END) as Daystart,
        MAX(CASE WHEN Endpoint='To' THEN EndpointTime END) as DayEnd
from
    @t t
        unpivot
    (EndpointTime for DayAndEndPoint in (SunFrom,SunTo,MonFrom,MonTo,TueFrom,TueTo,
WedFrom,WedTo,ThuFrom,ThuTo,FriFrom,FriTo,SatFrom,SatTo)) a
        cross apply
    (select SUBSTRING(DayAndEndpoint,1,3) as Day,SUBSTRING(DayAndEndpoint,4,4) as Endpoint) b
group by
    OfficeID,Day

结果：

OfficeID    Day  Daystart    DayEnd
----------- ---- ----------- -----------
51834       Fri  9           21
51834       Mon  8           22
51834       Sat  8           19
51834       Sun  12          17
51834       Thu  8           22
51834       Tue  8           22
51834       Wed  8           22

正如您所希望知道的那样，如果可能的话，最好重新设计您的数据库，使其比原始结果集更接近于此结果集 - 相同 "type" 的数据应该在一个列中，并且数据应该被建模为数据而不是嵌入列名中。

如果输出顺序和日期名称特别重要，则扩展变体：

declare @t table (OfficeID int,SunFrom  int,SunTo int,MonFrom int,MonTo int,
TueFrom int,TueTo int,WedFrom int,WedTo int,
ThuFrom int,ThuTo int,FriFrom int,FriTo int,
SatFrom int,SatTo int)
insert into @t(OfficeID,SunFrom,SunTo,MonFrom,MonTo,TueFrom,TueTo,
WedFrom,WedTo,ThuFrom,ThuTo,FriFrom,FriTo,SatFrom,SatTo) values
(51834,12,17,8,22,8,22,8,22,8,22,9,21,8,19)

declare @DayNameAndSort table (Day varchar(3) not null,ExtendedName varchar(19) not null,SortOrder int not null)
insert into @DayNameAndSort (Day,ExtendedName,SortOrder) values
('Fri','Friday',   5),
('Mon','Monday',   1),
('Sat','Saturday', 6),
('Sun','Sunday',   0),
('Thu','Thursday', 4),
('Tue','Tuesday',  2),
('Wed','Wednesday',3)


;With ReOriented as (
select
    OfficeID,Day,
        MAX(CASE WHEN Endpoint='From' THEN EndpointTime END) as Daystart,
        MAX(CASE WHEN Endpoint='To' THEN EndpointTime END) as DayEnd
from
    @t t
        unpivot
    (EndpointTime for DayAndEndPoint in (SunFrom,SunTo,MonFrom,MonTo,TueFrom,TueTo,
WedFrom,WedTo,ThuFrom,ThuTo,FriFrom,FriTo,SatFrom,SatTo)) a
        cross apply
    (select SUBSTRING(DayAndEndpoint,1,3) as Day,SUBSTRING(DayAndEndpoint,4,4) as Endpoint) b
group by
    OfficeID,Day
)
select
    OfficeID,ExtendedName,Daystart,DayEnd
from
    ReOriented r
        inner join
    @DayNameAndSort s
        on
            r.Day = s.Day
order by s.SortOrder

sql 服务器中的 UNPIVOT 没有聚合

UNPIVOT in sql server without Aggregate

sql

sql-server

tsql

sql-server-2012

unpivot