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SQL Query

Posted on 2016-09-28
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Last Modified: 2016-10-18
Not sure how to explain this but will try.  So I have some purchase order with 1 or more lines.  Not sure how to go about to write this query so that it take the last line with a "PART_ID" and put it into the first line.

In this example, line 2 has the Part_ID.  I want to populate the part id into line 1 and remove line 2.

If there are 3 lines, the 3rd line will have the part ID value.  It will populate the first line and remove line 2 and 3.  

With this example, can this be done via SQL Query?

Example
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Question by:holemania
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Accepted Solution

by:
slightwv (䄆 Netminder) earned 500 total points
ID: 41820957
Sorry for the Oracle syntax on the setup but this should be real close to porting easily to SQL Server.

I didn't include all the columns because they weren't 100% necessary for the test.
drop table tab1 purge;
create table tab1(purc_order_id number, line_no number, part_no varchar2(10), qty number);
insert into tab1 values(112319,1,null,2700);
insert into tab1 values(112319,2,'ABC123',6);
commit;

select * from (
select purc_order_id, line_no, max(part_no) over(partition by purc_order_id) part_no, qty
from tab1
)
where line_no=1;

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Expert Comment

by:Ryan Chong
ID: 41820960
quick try..
with cte as
(
	select *, row_number() over (partition by PURC_ORDER_ID order by PART_ID ) idx
	from yourTable
)
select * from cte
where idx = 1
order by PURC_ORDER_ID, PART_ID

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Expert Comment

by:Pawan Kumar
ID: 41820996
Try this

select a.* , r.cv PURC_ORDER_ID
from yourTable a
cross apply
(
	SELECT TOp 1 PURC_ORDER_ID cv
	FROM yourtable b
	WHERE b.PART_ID = a.PART_ID
	order by PART_ID
)r

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Expert Comment

by:Sharath
ID: 41821315
I think you need to ORDER BY LINE_ID in descending order.
;with cte AS (
SELECT *, ROW_NUMBER() OVER (PARTITION BY PURC_ORDER_ID ORDER BY LINE_ID DESC) rn FROM yourTable) 
SELECT * FROM cte WHERE rn = 1

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Also, what do you mean by "remove"? Do you want to delete data from table?
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Expert Comment

by:Pawan Kumar
ID: 41821425
Here it is ..

select a.* , r.cv PURC_ORDER_ID
from yourTable a
cross apply
(
	SELECT TOp 1 PURC_ORDER_ID cv
	FROM yourtable b
	WHERE b.PART_ID = a.PART_ID
	order by LINE_ID DESC
)r

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ENjoy!!
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Expert Comment

by:slightwv (䄆 Netminder)
ID: 41821518
Ryan Chong/Sharath,
Neither of yours work because it returns the 'DO NOT RECEIVE THIS LINE' row.

Pawan,
"TOP 1" isn't Oracle.
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Expert Comment

by:Pawan Kumar
ID: 41821559
Try this..

select a.* , r.cv PURC_ORDER_ID
from yourTable a
INNER JOIN
(
	SELECT TOP 1 PURC_ORDER_ID cv
	FROM yourtable b
	WHERE b.PART_ID = a.PART_ID
	order by LINE_ID DESC
)x

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Expert Comment

by:slightwv (䄆 Netminder)
ID: 41821563
Apologies, I forgot I ventured out of Oracle and this question is actually SQL Server.

Since I cannot test it, it looks like it will also return the 'DO NOT RECEIVE THIS LINE'  row.  Can you confirm it doesn't?
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Expert Comment

by:Pawan Kumar
ID: 41821584
Sharath
 - Author mentioned SQL Server.
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Expert Comment

by:Ryan Chong
ID: 41823060
@holemania,

so have you tried out the suggestions provided above if any of them meet your requirement?
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Expert Comment

by:Pawan Kumar
ID: 41824667
@Author - any update on this ? Have you tried suggestion given to you ?
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Expert Comment

by:slightwv (䄆 Netminder)
ID: 41825037
>>Have you tried suggestion given to you ?

Have you confirmed your example doesn't return the 'DO NOT RECEIVE THIS LINE'  row.   I don;'t have SQL Server to test with but the SQL looks like it will return it.
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Expert Comment

by:Pawan Kumar
ID: 41825044
@Author - Check out the below.... Solution by slightwv works. I have also changed mine.

CREATE TABLE tab1(purc_order_id INT, line_no INT, part_no varchar(10), qty INT)
GO


insert into tab1 values(112319,1,null,2700);
insert into tab1 values(112319,2,'ABC123',6);
GO


--SOLUTION BY slightwv (䄆 Netminder)
SELECT * FROM 
(
	SELECT purc_order_id, line_no, MAX(part_no) OVER(PARTITION BY purc_order_id) part_no, qty
	FROM tab1
)r
WHERE line_no=1;


-- My Solution
SELECT purc_order_id, line_no, qty ,part_no FROM 
(
	SELECT purc_order_id, line_no, ROW_NUMBER() OVER(PARTITION BY purc_order_id ORDER BY part_no DESC) rnk, qty ,part_no
	FROM tab1
)r
WHERE rnk=1;

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Expert Comment

by:slightwv (䄆 Netminder)
ID: 41825728
>>Solution by slightwv works.

I know.  I tested it long before I ever posted it.  That is why I also posted my test case.

>> I have also changed mine.

Seems to pretty much be a copy of what I originally posted.  Just a different Window function.  I used MAX and you use ROW_NUMBER.

I'm sure I could rewrite mine a few times if we are just looking for different ways to get the same result.
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Expert Comment

by:Sharath
ID: 41825846
<< Ryan Chong/Sharath,
Neither of yours work because it returns the 'DO NOT RECEIVE THIS LINE' row. >>

slightwv, agree with you. Haven't realized that. Thanks for pointing that.
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Expert Comment

by:Ryan Chong
ID: 41825949
Neither of yours work because it returns the 'DO NOT RECEIVE THIS LINE' row. >>
Well, same as many other experts, examples are tested before posted here, or at least working fine in test environment.
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Expert Comment

by:tliotta
ID: 41832969
Do you simply want the PART_ID from the highest LINE_NO row joined with all remaining columns from the lowest LINE_NO row? Does it matter if the lowest LINE_NO row has a null PART_ID or not? What if the highest LINE_NO row has a null PART_ID?

And are you trying to create a new result set or do you actually want to update the original table?
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Author Closing Comment

by:holemania
ID: 41848971
Thank you.  that worked.
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