Set an entire field row value if equal to a single value - sql-server

Question

Sorry for the confusing title, but I couldn't find a better way to explain it.
I have some results where one row should populate an entire row if a specific code is found.
Here's the data:
PartID CustomerID Status Qty Notes
1000 900123 1 10 NULL
911 900123 1 5 NULL
Here's what I want it to do:
PartID CustomerID Status Qty Notes
1000 900123 1 10 911
911 900123 1 5 911
How could I write a query to give the notes field a value of 911 if one PartID has a value of 911?
EDIT: Thanks for the replies everyone, but I was hoping I could use a Select statement to accomplish this. I accomplished this by using a temp table, updating if the customer has a 911 in their order, updated only that customer's notes with 911, then queried the temp table for the data.

Answer 1

Try this:
UPDATE Table
SET Notes=(CASE WHEN (SELECT Count(1) FROM Table Where PartId=911)>0 THEN 911 ELSE NULL END)
or
UPDATE t
SET t.Notes= t2.PartId
FROM Table t
LEFT JOIN Table t2 on t2.PartId=911

Answer 2

update #t
set Notes=(select PartID from #t where PartID in(911))
select * from #t
SEE DEMO

Answer 3

You could use something like
update MyTable
set Notes = '911'
where (select count(1) from #MyTableVar where PartID = 911) > 0
For example:
DECLARE #MyTableVar table( PartID int,
CustomerID int,
Status int,
Qty int,
Notes varchar(50));
insert into #MyTableVar(PartID, CustomerID, Status, Qty, Notes)
values (1000, 900123, 1, 10, null)
insert into #MyTableVar(PartID, CustomerID, Status, Qty, Notes)
values (911, 900123, 1, 5, null)
select * from #MyTableVar
update #MyTableVar
set Notes = '911'
where (select count(1) from #MyTableVar where PartID = 911) > 0
select * from #MyTableVar
EDIT:
To just change the returned values, rather than updating the database you could do the following (based on the above example):
select
mtv.PartID,
mtv.CustomerID,
mtv.Status,
mtv.Qty,
case when (select count(1) from #MyTableVar where PartID = 911) > 0
then '911'
else mtv.Notes
end as Notes
from
#MyTableVar mtv

Answer 4

select PartID, CustomerID, Status, Qty,
case when exists(select * from notes where PartID = 911) then '911' else Notes end Notes
from notes

Answer 5

I would recommend you to split the logic in two separate moves:
--1. check condition
declare #IsPartIDDetected int = 0;
if exists (select PartID from Notes where PartID = 911 )
set #IsPartIDDetected = 1;
--2. get filteredoutput
select PartID, CustomerID, Status, Qty,
case when #IsPartIDDetected = 1 then '911' else COALESCE(Notes,'') end as Notes
from Orders
This solution has an optimal execution plan and will cost less RAM.
COALESCE command added as an example of NULL values processed.
You can also wrap it into single CTE statement:
WITH partCondition as (
select top 1 PartID as conditon from Notes where PartID = 911
)
select PartID, CustomerID, Status, Qty,
case
when exists ( select * from partCondition )
then 911 --conditon met
else Notes end --condition NOT met
as Notes
from Orders;
This will help to lower execution costs.

Answer 6

Not clear what one partID means
Do you mean CustomerID with one partID of 911?
run these two statements:
update customer
set notes = 911
where partID = 911
and notes <> 911;
update c2
set c2.notes = 911
from customer c1
join customer c2
on c2.CustomerID = c1.CustomerID
and c1.partID = 911
and c2.partID <> 911
and (c2.notes <> 911 or c2.notes is null);
this one statement might do it but not sure it would be faster:
update c2
set c2.notes = 911
from customer c1
join customer c2
on c2.CustomerID = c1.CustomerID
and c1.partID = 911
and (c2.notes <> 911 or c2.notes is null);