Returning Mutiple Addresses as a Single Record + current addresses

Question

Hello All,
I have to return students home and dorm addresses as a single record.
Need to go from something like this:
LAST_NAME     FIRST_NAME     ADDY_TYPE   ADDRESS             ZIP
Smith                John             HOME         123 Awesome St     10003
Smith               John               DORM         Oak Quad             10013To this desired format:
LAST_NAME  FIRST_NAME     ADDY_TYPE  ADDRESS         ZIP        ADDY_TYPE     ADDRESS     ZIP
Smith            John      HOME        123 Awesome St  10003   DORM            Oak Quad     10013Also need to get their latest addresses by date.
The database keeps records of every place the students have move from dorm to dorm
and some students permanent residences ("HOME") has changed as well.
Would like to return only one DORM address and only one HOME address
for every student.
So I'm looking at possibly a CASE function to put it on one line/record and a RANK BY() or DENSE_RANK to determine the latest addresses.
Hope I'm making some sense and as always much appreciation for any help. Thanks.

Answer 1

Hi,
user11137889 wrote:
Also need to get their latest addresses by date. Then you must have a column (I'll call it addy_date) that can be used to tell you which is the latest.
The database keeps records of every place the students have move from dorm to dorm
and some students permanent residences ("HOME") has changed as well.
Would like to return only one DORM address and only one HOME address
for every student.
So I'm looking at possibly a CASE function to put it on one line/record and a RANK BY() or DENSE_RANK to determine the latest addresses. I think that's the best way, though if you want only one of each type, then ROW_NUMBER is more appropriate than RANK or DENSE_RANK.
WITH    got_rnum     AS
     SELECT     last_name
     ,     first_name
     ,     addy_type
     ,     address
     ,     zip
     ,     ROW_NUMBER () OVER ( PARTITION BY  last_name
                               ,                    first_name
                         ,             addy_type
                         ORDER BY        addy_date     DESC     NULLS LAST
                       ) AS rnum
     FROM    table_x
--     WHERE     ...          -- Any filtering goes here
SELECT    last_name
,       first_name
,       MIN (CASE WHEN addy_type = 'HOME' THEN address END)     AS home_address
,       MIN (CASE WHEN addy_type = 'HOME' THEN zip     END)     AS home_zip
,       MIN (CASE WHEN addy_type = 'DORM' THEN address END)     AS dorm_address
,       MIN (CASE WHEN addy_type = 'DORM' THEN zip     END)     AS dorm_zip
FROM       got_rnum
WHERE       rnum     = 1
GROUP BY  last_name
,            first_name
;This assumes the combination (last_name, first_name) uniquely identifies a student.
If you'd post CREATE TABLE and INSERT statements for some sample data, then I could test this.