PIVOT and UNPIVOT

Question

I have a column called Qty and AMt
QTY     AMT
1          2
1           1
2           2
I need to pivot/unpivot this in such a way that I need a collumn called Measurecode and Measure
MeasureCode         Measure
QTY                            1
AMT                             2
QTY                             1
AMT                              1
QTY                              2
AMT                              2
How do I do this?
SPPandey

Answer 1

You must have a column that uniquely identifies each row in the original table. Otherwise, after unpivot shuffle rows may occur. For example, if you need sorting by Measure column.
-- code #1
;with QA as (
SELECT ID, 1 as Seq, QTY, AMT
from table
union all
SELECT ID, 2, QTY, AMT
from table
SELECT ID,
MeasureCode= case when Seq=1 then 'QTY' else 'AMT' end,
Measure= case when Seq=1 then QTY else AMT end
from QA
order by ID, MeasureCode desc;
or
-- code #2
SELECT ID, MeasureCode, Measure
from table
unpivot (Measure for MeasureCode in (QTY, AMT)) as U;
If there is no column that identifies the rows, you can create temporary column with sequence before the unpivot:
-- code #2 v2
SELECT Seq, MeasureCode, Measure
from (SELECT Seq= row_number() over (order by (SELECT 0)), QTY, AMT from table) as S
unpivot (Measure for MeasureCode in (QTY, AMT)) as U;
José Diz     Belo Horizonte, MG - Brasil