Pivot a fixed multiple column table in sql server - sql

Question

I have a table which I need to pivot for reporting services:
DateCreated Rands Units Average Price Success % Unique Users
-------------------------------------------------------------------------
2013-08-26 0 0 0 0 0
2013-08-27 0 0 0 0 0
2013-08-28 10 2 5 100 1
2013-08-29 12 1 12 100 1
2013-08-30 71 9 8 100 1
2013-08-31 0 0 0 0 0
2013-09-01 0 0 0 0 0
In other words I need to have Rands, Units, Average Price etc at rows and the dates as columns.
I have read various examples but I just can't seem to get it right.
Any help would be much appreciated!

Answer 1

This one will do what you want, but you have to specify all the dates
select
c.Name,
max(case when t.DateCreated = '2013-08-26' then c.Value end) as [2013-08-26],
max(case when t.DateCreated = '2013-08-27' then c.Value end) as [2013-08-27],
max(case when t.DateCreated = '2013-08-28' then c.Value end) as [2013-08-28],
max(case when t.DateCreated = '2013-08-29' then c.Value end) as [2013-08-29],
max(case when t.DateCreated = '2013-08-30' then c.Value end) as [2013-08-30],
max(case when t.DateCreated = '2013-08-31' then c.Value end) as [2013-08-31],
max(case when t.DateCreated = '2013-09-01' then c.Value end) as [2013-09-01]
from test as t
outer apply (
select 'Rands', Rands union all
select 'Units', Units union all
select 'Average Price', [Average Price] union all
select 'Success %', [Success %] union all
select 'Unique Users', [Unique Users]
) as C(Name, Value)
group by c.Name
You can create a dynamic SQL for this, something like this:
declare #stmt nvarchar(max)
select #stmt = isnull(#stmt + ',', '') +
'max(case when t.DateCreated = ''' + convert(nvarchar(8), t.DateCreated, 112) + ''' then c.Value end) as [' + convert(nvarchar(8), t.DateCreated, 112) + ']'
from test as t
select #stmt = '
select
c.Name, ' + #stmt + ' from test as t
outer apply (
select ''Rands'', Rands union all
select ''Units'', Units union all
select ''Average Price'', [Average Price] union all
select ''Success %'', [Success %] union all
select ''Unique Users'', [Unique Users]
) as C(Name, Value)
group by c.Name'
exec sp_executesql #stmt = #stmt

Answer 2

I solved this in the end using dynamic sql, very similar to the marked answer. I wasn't able to find a way of doing this without dynamic sql. The dates had to be in order and the last 7 days, they also had to use the day of the week names (which I didn't specify in the question).
The biggest change I needed to make was changing the table variable into a temporary table.
This is because dynamic sql statements execute in a different context and don't know about any variables you have created.
In the end I was completely off track trying to use PIVOT and APPLY should be used in situations where there are more than one "type" of value.
I have included my solution below since it could help someone who has a similar problem:
CREATE TABLE #SummaryTable
(
[DateCreated] DATE UNIQUE,
[Rands] DECIMAL,
[Units] INT,
[Average Price] DECIMAL,
[Success %] INT,
[Unique Users] INT
);
--Code to fill table
declare #stmt nvarchar(max)
select #stmt = isnull(#stmt + ',', '') +
'max(case when t.DateCreated = ''' + convert(nvarchar(16), t.DateCreated, 126)
+ ''' then c.Value end) as [' + left(datename(dw, t.DateCreated),3) + ']'
from #SummaryTable as t
select #stmt = '
select
c.Name, ' + #stmt + ' from #SummaryTable as t
outer apply (
select ''Rands'', Rands union all
select ''Units'', Units union all
select ''Average Price'', [Average Price] union all
select ''Success'', [Success %] union all
select ''Unique Users'', [Unique Users]
) as C(Name, Value)
group by c.Name'
exec(#stmt)