既然您已经提供了示例,我已经更新了我的答案,它根据您提供的数据为您提供了解决方案。
请注意,您可以更改日期范围,查询也会相应更新。
请记住,此 SQL 查询适用于 SQL Server:
create table #tbl1 (
[UserId] int
,[UserName] nvarchar(max)
,[EntryDateTime] datetime
);
insert into #tbl1 ([UserId],[UserName],[EntryDateTime])
values
(1,'John Doe','20171109')
,(1,'John Doe','20171109')
,(1,'John Doe','20171110')
,(1,'John Doe','20171111')
,(2,'Mike Smith','20171109')
,(2,'Mike Smith','20171110')
,(2,'Mike Smith','20171110')
,(2,'Mike Smith','20171110')
;
-- declare variables
declare
@p1 date
,@p2 date
,@diff int
,@counter1 int
,@counter2 int
,@dynamicSQL nvarchar(max)
;
-- set variables
set @p1 = '20171109'; -- ENTER THE START DATE IN THE FORMAT YYYYMMDD
set @p2 = '20171111'; -- ENTER THE END DATE IN THE FORMAT YYYYMMDD
set @diff = datediff(dd,@p1,@p2); -- used to calculate the difference in days
set @counter1 = 0; -- first counter to be used in while loop
set @counter2 = 0; -- second counter to be used in while loop
set @dynamicSQL = 'select pivotTable.[UserId] ,pivotTable.[UserName] as [Name] '; -- start of the dynamic SQL statement
-- to get the dates into the query in a dynamic way, you need to do a while loop (or use a cursor)
while (@counter1 < @diff)
begin
set @dynamicSQL += ',pivotTable.[' + convert(nvarchar(10),dateadd(dd,@counter1,@p1),120) + '] '
set @counter1 = (@counter1 +1)
end
-- continuation of the dynamic SQL statement
set @dynamicSQL += ' from (
select
t.[UserId]
,t.[UserName]
,cast(t.[EntryDateTime] as date) as [EntryDate]
,count(t.[UserId]) as [UserCount]
from #tbl1 as t
where
t.[EntryDateTime] >= ''' + convert(nvarchar(10),@p1,120) + ''' ' +
' and t.[EntryDateTime] <= ''' + convert(nvarchar(10),@p2,120) + ''' ' +
'group by
t.[UserId]
,t.[UserName]
,t.[EntryDateTime]
) as mainQuery
pivot (
sum(mainQuery.[UserCount]) for mainQuery.[EntryDate]
in ('
;
-- the second while loop which is used to create the columns in the pivot table
while (@counter2 < @diff)
begin
set @dynamicSQL += ',[' + convert(nvarchar(10),dateadd(dd,@counter2,@p1),120) + ']'
set @counter2 = (@counter2 +1)
end
-- continuation of the SQL statement
set @dynamicSQL += ')
) as pivotTable'
;
-- this is the easiet way I could think of to get rid of the leading comma in the query
set @dynamicSQL = replace(@dynamicSQL,'in (,','in (');
print @dynamicSQL -- included this so that you can see the SQL statement that is generated
exec sp_executesql @dynamicSQL; -- this will run the generate dynamic SQL statement
drop table #tbl1;
让我知道这是否是您要找的。p>