Re: How to Resequence a Numeric SQL Column?

I'd look at a merge statement

merge into Turnover_Waiting_List O
using ( select Item_Name, Item_Type, Item_Attribute,
​ ​
Wait_Sequence
​,
row_number() over(order by
Item_Name, Item_Type, Item_Attribute,
​ ​
Wait_Sequence
​) * 10 as new_seq
​ ) as N
​on n.item_name = o.item_name
and n.item_type = o.item_type
and n.item_attribute = o.item_attribute
and n.wait_sequence = o.wait_sequence
when matched
update
set wait_sequence = n.new_seq

Charles​

​

​

On Tue, Mar 29, 2016 at 12:04 PM, <dlclark@xxxxxxxxxxxxxxxx> wrote:

Basically, what I am trying to accomplish is to resequence, in
place, a numeric column from 10 by 10. This is used in a priority list
where an entry's priority can change. Thus, for example, if there are 5
entries in a particular group and the entry at priority 30 is changed to
priority 5, I then want to resequence that group of entries from 10 such
that the changed entry will remain with the highest priority of 10 --
i.e., raising it from 30 to 10 -- and moving all other entries in the
group down by 10 for each existing entry. I've been able to resequence
the column but I have not been able to resequence according to the new
priority sequence -- rather, it resequences by the primary identity key no
matter what I try (as shown in the example below). How can I accomplish
this?

Alter Sequence TEMP_SEQ Restart with 10;

Update Turnover_Waiting_List
Set Wait_Sequence = NEXT VALUE FOR TEMP_SEQ
Where TOWAITLT_ID IN (Select TOWAITLT_ID
From Turnover_Waiting_List
Where Item_Name = 'TOWAITBRSM'
And Item_Type = '*MODULE'
And Item_Attribute = 'SQLRPM'
Order by Item_Name, Item_Type, Item_Attribute,
Wait_Sequence)
With NC;

Sincerely,

Dave Clark
int.ext: 91078
direct: (937) 531-6378
home: (937) 751-3300

Winsupply Group Services
3110 Kettering Boulevard
Dayton, Ohio 45439 USA
(937) 294-5331




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