SQL Query: New columns for data with some matching criteria - sql

Question

I'm working with a query that pulls data from a table and arranges it in a manner similar to below:
Query1
BldID UnitID Res1
1 201 John Smith
1 201 Jane Doe
1 202 Daniel Jones
1 202 Mark Garcia
2 201 Maria Lee
2 201 Paul Williams
2 201 Mike Jones
I'd like to modify the query output in SQL/Design so that each resident that shares a building / unit shows as a new column on the same row as shown below:
BldID UnitID Res1 Res2 Res3
1 201 John Smith Jane Doe
1 202 Daniel Jones Mark Garcia
2 201 Maria Lee Paul Williams Mike Jones
I apologize if this is crude/not enough information but any help would be greatly appreciated.

Answer 1

You can try using conditional aggregation
with cte as
(
select *, row_number() over(partition by BldID,UnitID order by Res1) as rn
from tablename
)
select BldID,UnitID,
max(case when rn=1 then Res1 end) as Res1,
max(case when rn=2 then Res1 end) as Res2,
max(case when rn=3 then Res1 end) as Res3
from cte
group by BldID,UnitID

Answer 2

So, drawing from a few different sources, this might work, try pasting this intoa query editor, and see if it'll run.
TRANSFORM MAX(Res1)
SELECT BldID, UnitID
, (
SELECT COUNT(T1.Marks)
FROM tableName AS T1
WHERE
T1.BldgID = T2.BldgID AND
T1.UnitID = T2.UnitID AND
T1.Res1 >= T2.Res1
) AS Rank, Res1
FROM tableName t2
GROUP BY BldID, UnitID
PIVOT Rank;

Answer 3

2 years late, but maybe I can add something, in Access we are surgeons operating with kitchen knifes, things must be done in the Access Way...
I tested it having this table UnitStudentBlock
BldID
UnitID
Res1
1
201
John Smith
1
201
Jane Doe
1
202
Daniel Jones
1
202
Mark Garcia
2
201
Maria Lee
2
201
Paul Williams
2
201
Mike Jones
2
201
Julian Gomes
As Access doesn't have row_number, first I created a table with an auto increment field so that we can have something like a row number:
CREATE TABLE TableWithId
(
Id COUNTER,
BldID INT,
UnitID INT,
Res1 VARCHAR(100),
ResNumber VARCHAR(100)
)
Then I inserted all the data from the initial table into this newly created table:
INSERT INTO TableWithId (BldID, UnitID, Res1)
SELECT *
FROM UnitStudentBlock
ORDER BY BldID,
UnitID
Then I updated everything using DCOUNT to have a row_number partitioned:
UPDATE TableWithId
SET ResNumber = 'Res' + Cstr(DCOUNT("*", "TableWithId", "ID >=" & [ID]
& " AND UnitId = " & [UnitId]
& " AND BldId = " & [BldId]))
And finally we can run the query that returns the data:
TRANSFORM MAX(Res1)
SELECT BldID, UnitID
FROM TableWithId
GROUP BY BldID, UnitID
PIVOT ResNumber