Rotate/pivot table with aggregation in Oracle

Question

I\'d like to rotate a table in Oracle 11g. The pivot option requires an aggregation. This is my original table:

project | attribute | value
=================         


        

Answer 1

Yes I think so. It is easy to do a pivot like this with a MAX aggregate:

SELECT
    *
FROM
(
    SELECT
        project,
        attribute,
        value
    FROM
        table1
) AS SourceTable
PIVOT
(
    MAX(value)
    FOR attribute IN ([foo],[bar],[baz])
) AS pvt

Otherwise you have to do a case statement inside the a max aggregate. Like this:

SELECT
    MAX(CASE WHEN attribute='foo' THEN value ELSE NULL END) AS foo,
    MAX(CASE WHEN attribute='bar' THEN value ELSE NULL END) AS bar,
    MAX(CASE WHEN attribute='baz' THEN value ELSE NULL END) AS baz,
    project
FROM
    table1
GROUP BY
    project

This is almost the same thing as doing the PIVOT. But I would prefer doing the PIVOT over the CASE WHEN MAX..