asked on

Change Columns into rows

I have a table consisting of 3 columns ITEMNMBR, MAX QTY, MIN QTY I want the the Max and Min to display as rows instead of columns

Current results
ITEMNMBR MAX QTY MIN QTY
------------------------------ -------------------------------------------------- ----------------------------------
ATI47BB 50 5
ATIAOPS 50 5
ATIARWRENCH 50 5

Desired Results
ITEMNMBR MAX_MIN QTY
------------------------------ --------------------------------------------------
ATI47BB 50
ATI47BB             5
ATIAOPS 50
ATIAOPS             5
ATIARWRENCH             50
ATIARWRENCH 5

ASKER CERTIFIED SOLUTION

Patrick Matthews

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Patrick Matthews

Or to show on each row whether it's min or max...

SELECT ITEMNMBR, 'Max' AS MIN_MAX, MAX_QTY AS MAX_MIN_QTY
FROM SomeTable
UNION ALL
SELECT ITEMNMBR, 'Min' AS MIN_MAX, MIN_QTY AS MAX_MIN_QTY
FROM SomeTable
ORDER BY 1 ASC, 2 DESC

Aeriden

Here is one potential approach that may work for you if have more complex requirements than unions (the other options are better, but thought to share this approach, just in case a more "manual" approach was warranted)...

/* Change the @ variables size/type to match itemnmbrs size/type */
declare @itemnmbr char(11)
declare @maxqty int
declare @minqty int

/* replace table1 name with the actual old table name */
select @itemnmbr = min(itemnmbr) from table1

while @itemnmbr is not null
begin
/* use the actual variable names for maxqty, minqty from table1 */
select @maxqty = maxqty, @minqty = minqty from table1 where itemnmbr = @itemnmbr

/* replace table2 anme with the actual new table name, min_max_qty in the new table */
insert into table2 (itemnmbr, min_max_qty) values (@itemnmbr, @maxqty)
insert into table2 (itemnmbr, min_max_qty) values (@itemnmbr, @minqty)

select @itmnmbr = min(itemnmbr) from table1 where itemnmbr > @itemnmbr
end

Sean Stuber

if you don't want to query your table multiple times...

select itemnbr, case when n = 1 then max_qty else min_qty end as max_min
from yourtable, (select 1 n union all select 2 n) as x

or, to include the max/min flag as shown above....

select itemnbr, case when n = 1 then max_qty else min_qty end as max_min,
case when n= 1 then 'Max' else 'Min' end as max_min_type
from yourtable, (select 1 n union all select 2 n) as x

Fred Webb

ASKER

Thanks Matthew that worked perfectly, and thanks to all those that responded .

PortletPaul

You can use a Common Table Expression (CTE) to help reduce the query overhead.
Using "union all" rather than "union" ensures no rows get suppressed (I assume that's what you want).
You might also want an indicator of 'min' or 'max' (or something similar) to help sort the output

with src_data as (
                   /* place query for your source data here
                      e.g.
                          select * from my_table 
                          where something...
                   */
                 )

    select itemnmbr, max_qty as max_min_qty, 'max' as min_or_max
    from src_data
union all
    select itemnmbr, min_qty as max_min_qty, 'min' as min_or_max
    from src_data
order by itemnmbr, min_or_max

Open in new window

 ITEMNMBR     MAX_MIN_QTY     MIN_OR_MAX    
 -----------  --------------  ------------- 
 ATI47BB      50              max           
 ATI47BB      5               min           
 ATIAOPS      50              max           
 ATIAOPS      5               min           
 ATIARWRENVH  50              max           
 ATIARWRENVH  5               min

Open in new window