SQL Server Forums
Profile | Register | Active Topics | Members | Search | Forum FAQ
 
Register Now and get your question answered!
Username:
Password:
Save Password
Forgot your Password?

 All Forums
 General SQL Server Forums
 New to SQL Server Programming
 Get value by looping through table column
 New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic  

kme
Starting Member

USA
1 Posts

Posted - 04/05/2014 :  16:54:30  Show Profile  Reply with Quote
Hello,

Here are two tables:

TABLE_A
[ac] [dest]
1 A
1
1
2
2
3
3 B
3

(ac=1, dest=A; ac=3, dest=B)
The space between '1' and 'A' isn't showing up correctly.

TABLE_B
[fleet] [ron]
1 A
1 A
1 A
1 A
1 A
2
2
2
2
3 B
3 B

(fleet=1, ron=A; fleet=3, ron=B; etc.etc.)

I would like to fill TABLE_B's column "ron" by referring to TABLE_A's column "dest".
ac = fleet, and for each ac, I would like to loop through the 'dest' column in TABLE_A from top to bottom to get the top most value. If there are no values (like with ac = 2), then value is blank.
For 1, the value is A.
For 2, the value is blank.
For 3, the value is B.

Therefore, in TABLE_B, for all 'ron' for fleet=1, the value is filled A.
For all 'ron' for fleet=2, the value is blank.
For all 'ron' for fleet=3, the value is B.

How do you code this?

- create variable 'v'
- where ac=fleet, loop through 'dest' from top to bottom to get top-most value. variable 'v' = the value.
- in TABLE_B, for each ac=fleet, insert variable 'v' into the 'ron' column

Thanks so much, I would appreciate any help.

Edited by - kme on 04/05/2014 17:01:00

visakh16
Very Important crosS Applying yaK Herder

India
52325 Posts

Posted - 04/13/2014 :  14:49:53  Show Profile  Reply with Quote
looks like this to me

UPDATE b
SET ron = a.dest
FROM tableB b
INNER JOIN (SELECT ac,MAX(dest) AS dest
            FROM tableA
            GROUP BY ac)a
ON a.ac = b.fleet


------------------------------------------------------------------------------------------------------
SQL Server MVP
http://visakhm.blogspot.com/
https://www.facebook.com/VmBlogs
Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
SQL Server Forums © 2000-2009 SQLTeam Publishing, LLC Go To Top Of Page
This page was generated in 0.11 seconds. Powered By: Snitz Forums 2000