Turn Columns into Rows partitioned - sql

Question

I have a table like this:
CFL52_ID CFL52_PRICE CFL51_MILEAGE
------------ --------------- -----------------
1 100000.00 10000
1 200000.00 20000
2 800000.00 10000
2 900000.00 20000
I want to pivot the columns into rows. Mileage was the column title and Price the value. Turning into something like this:
CFL52_ID [10000] [20000]
------------ --------------- -----------------
1 100000.00 200000.00
2 800000.00 900000.00
Notice that id was grouping, prices are pivoted and mileage turning into columns title, Mileage are dynamic -could increment- .
I've tried with no success with this:
SELECT [10000],[20000]
FROM ( SELECT
CFL52_PRICE as indicatorvalue,
CFL51_MILEAGE as indicatorname
FROM [TFL52_PRICES_M] p
INNER JOIN [TFL51_PARAM_MILEAGE] k ON CFL52_CFL51_CODIGO = CFL51_CODIGO
WHERE CFL52_DATES = '2018-07-01 00:00:00.000' AND CFL52_DATEEN= '2018-07-02 00:00:00.000') as a
pivot
(
max(indicatorvalue) for indicatorname in ([10000],[20000])
) p

Answer 1

just use conditional aggregation instead. You also should use aliases to indicate which table a column belongs to.
select CFL52_ID
, [10000] = MAX(case when CFL51_MILEAGE = 10000 then CFL52_PRICE end)
, [20000] = MAX(case when CFL51_MILEAGE = 20000 then CFL52_PRICE end)
FROM [TFL52_PRICES_M] p
INNER JOIN [TFL51_PARAM_MILEAGE] k ON CFL52_CFL51_CODIGO = CFL51_CODIGO
WHERE CFL52_DATES = '2018-07-01 00:00:00.000'
AND CFL52_DATEEN= '2018-07-02 00:00:00.000'
group by CFL52_ID

Answer 2

To manage dynamic titles you need dynamic TSQL:
if OBJECT_ID('dbo.test') is null
create table dbo.test(CFL52_ID varchar(50), CFL52_PRICE decimal(18,2), CFL51_MILEAGE int)
--populate test table
insert into dbo.test values
(1, 100000.00, 10000),
(1, 200000.00, 20000),
(2, 800000.00, 10000),
(2, 900000.00, 20000)
declare #columns nvarchar(max)='' --holds all the numbers that will become column names
declare #sql nvarchar(max)='' --contains the TSQL dinamically generated
--generate dynamic column names
select #columns = #columns + ', [' + cast(CFL51_MILEAGE as varchar(max))+ ']'
from dbo.test
group by CFL51_MILEAGE
--remove first (unnecessary) comma
set #columns = RIGHT(#columns, len(#columns)-2)
--build dynamic TSQL query
set #sql = #sql + ' select piv.[CFL52_ID], ' + #columns
set #sql = #sql + ' from ( '
set #sql = #sql + ' select [CFL52_ID], [CFL52_PRICE], [CFL51_MILEAGE] '
set #sql = #sql + ' from dbo.test '
set #sql = #sql + ' ) src '
set #sql = #sql + ' pivot ( '
set #sql = #sql + ' max([CFL52_PRICE]) '
set #sql = #sql + ' for [CFL51_MILEAGE] in ('+#columns+') '
set #sql = #sql + ' ) piv '
--execute dynamic TSQL query
exec(#sql)
output:
If you add more rows to your input table with CFL51_MILEAGE values of 10000 and 20000, then input and output tables will be:
If you add more rows to your input table introducing new CFL51_MILEAGE values (other than 10000 or 20000), then input and output tables will be: