Pivot help - Strings not values

Mr Neil

Hey all,

I need some direction on how to achieve the following outcome.

I've used 11g pivot before with values that suited the (mandatory) aggrigate function, but I can't see a solution for this. Any help appreciated.

   

PROJECT	WORKER	THE_DATE
Project_A	John	05/23/2016
Project_A	Mary	05/23/2016
Project_A	Mary	05/24/2016
Project_A	Steve	05/24/2016
Project_A	Mary	05/25/2016
Project_A	Mary	05/26/2016
Project_B	John	05/23/2016
Project_B	Steve	05/24/2016

  

WORKER	05/23/2016	05/24/2016	05/25/2016	05/26/2016
John	Project_A
John	Project_B
Steve		Project_A
Steve		Project_B
Mary	Project_A	Project_A	Project_A	Project_A

Thanks.

NT

Frank Kulash

Hi,

Whenever you have a question, please post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all the tables involved, and the exact results you want from that data, so that the people who want to help you can re-create the problem and test their ideas.

Explain, using specific examples, how you get those results from that data.

Always say what version of Oracle you're using (e.g. 11.2.0.2.0).

See the forum FAQ:

Use the analytic ROW_NUMBER function to assign numbers 1, 2, 3, ... to each row, with a separate series for each worker and date.  Each distinct combination of worker and assigned number will result in a row of output.

CarlosDLG

You will usually get quicker and more accurate answers if you post create table statements and inserts with some sample data, along with an explanation of the specific problem you are facing.

Here is one way to do it:

WITH test_data as
(
SELECT 'Project_A' project,'John' worker,date '2016-05-23' the_date FROM DUAL union all
SELECT 'Project_A','Mary',date '2016-05-23'  FROM DUAL union all
SELECT 'Project_A','Mary',    date '2016-05-24' FROM DUAL union all
SELECT 'Project_A','Steve',date '2016-05-24' FROM DUAL union all
SELECT 'Project_A','Mary',date '2016-05-25' FROM DUAL union all
SELECT 'Project_A','Mary',date '2016-05-26'  FROM DUAL union all
SELECT 'Project_B','John',date '2016-05-23' FROM DUAL union all
SELECT 'Project_B','Steve',date '2016-05-24' FROM DUAL
)
select worker,c23,c24,c25,c26 from
(
  SELECT t.*, dense_rank() over (PARTITION BY worker ORDER BY project) AS rn
  FROM test_data t
)
pivot
(
  MAX(project) FOR the_date in (date '2016-05-23' AS C23,date '2016-05-24' AS C24,date '2016-05-25' AS C25,date '2016-05-26' AS C26)
)
ORDER BY worker;

Results:

WORKER	C23	C24	C25	C26
John	Project_A
John	Project_B
Mary	Project_A	Project_A	Project_A	Project_A
Steve		Project_A
Steve		Project_B

Paulzip

You cannot dynamically generate your columns (e.g. generate your column names based on the data) without using special techniques (dynamic SQL), SQL has to have static columns at execution time.

Here's another way to do it.

select worker, d1, d2, d3, d4

from

(

  select project, worker,

         dense_rank() over (order by the_date) as date_rank,

         dense_rank() over (order by project) as project_rank

  from test_data t

)

pivot (

  max(project)

  for date_rank in (1 as D1, 2 as D2, 3 as d3, 4 as d4)

)

order by worker

WORKER	D1	D2	D3	D4
John	Project_A
John	Project_B
Mary	Project_A	Project_A	Project_A	Project_A
Steve		Project_A
Steve		Project_B