Returning two rows with one column containing only one place

Question

Dear all;
I have a query that returns two rows similar to this below
ID      PLACE            PROGRAM
A       NEWYORK      PROGRAM A
A       NEWYORK      PROGRAM B
I would like this instead
ID      PLACE             PROGRAM
A       NEWYORK       PROGRAM A
                               PROGRAM  B
All help is appreciated. Thank you.Edited by: user13328581 on Mar 22, 2011 11:52 AM

Answer 1

user13328581 wrote:
WOW...THanks a lot Solomon, I have never used partitions and row_number in such a manner...can you please explain your logic.Sure:
row_number() over(partition by id order by place,program)This will take all rows returned by the query andsplit them into buckets (partitions) by id. Inside each bucket it will order rows by place and program and assign them row numbers. So for each ID row number 1 will be row with first (alphabetically) place first programt. And this is the row where we want ID to show up. That is why we wrap the above analytic function in CASE statement which will do exactly that. Now:
row_number() over(partition by id,place order by program)does pretty much the same just bucket is ID and PLACE combination. So for each such combination we want to show only for the first (alphabetically) programt.
Now notice in ORDER BY clause I prefix ID and PLACE with table alias. You must do it since otherwise query alias ID and PLACE will take precedence resulting in wrong sort order (remember we nulled all ID and PLACE except for row number 1).
SY.