Sql query not sorting

Hi All,

I have two stored proc's that are a literally copy of each other. One runs again one table, the other another table.  They started off as the same query I just changed the table alias. The columns they are running again are the same type, eg Datetime and nvarchange. The issue I have is one of the queries is returning the datetime  order by month, the other isn't. I need it ordered by month. When looking at the excution plan one is doing a sort the other is doing a hash compare.

I've checked the table structure, the only different is the nvarchar column in one is 255 in size, the other (non sorting) is 20. Neither of these columns are used to sort. The index's are the same, and not on the open time column. Collation is also the same. It is very frustrating

Top one doesn't sort, bottom one does
Select 
sdi.sdnumber,
DATENAME(Month, SDi.OpenTime)as openmonth , 
CAST(YEAR(sdi.OpenTime) AS nvarchar) AS openyear
from ServiceDeskInteractions sdi
GROUP BY dateadd(month,datediff(month, 0, SDi.OpenTime),0),SDi.OpenTime,sdi.sdnumber


Select
TC.[Incident ID],
DATENAME(Month, TC.[Open Time])as openmonth , 
CAST(YEAR(TC.[Open Time]) AS nvarchar) AS openyear
from TargetCalls tc
GROUP BY dateadd(month,datediff(month, 0, TC.[Open Time]),0),TC.[Open Time],TC.[Incident ID]

Open in new window


Any hints or suggestions would be great.

Cheers
JL
LVL 2
jaLoudenAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

tliottaCommented:
Any hints or suggestions would be great.

The only way to guarantee a sort order with SQL is to include an ORDER BY clause. I realize this is for SQL Server, so it's only "mostly SQL"; but I would expect the same behavior.

Tom
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Aaron TomoskySD-WAN SimplifiedCommented:
Yep. Without a order by its random. One of them probably just happens to be in the right order.
0
DcpKingCommented:
There's no reason for either of your pieces of code to return results in any particular order. Add an ORDER BY to each one and life will improve for you.

But why does one return ordered and the other not ?   you ask. A good question!

In the "sorting" one you probably entered the records in the order you now want them to appear, and you haven't deleted any, or inserted any, and your input process was fortunate enough to get a sequential set of pages to write into, and probably a few other fortunate things too.  

In the "non-sorting" table you may have entered the records in any old order; you might have added a few incorrectly, so deleted them and then added different ones before re-entering the corrected versions, etc., etc. I'm sure other contributors here can tell you of other reasons why SQL Server would or would not happen to end up with your records in perfect sequence.

Our point is, SQL (from SQL Server, Oracle, Access, Paradox, Postgres, or whomever) makes no promises about how you'll get your data back unless you make explicit specifications.
0
Scott PletcherSenior DBACommented:
Yes, order is only guaranteed if you add ORDER BY.

So add this at the end of both of your existing queries:

ORDER BY openmonth

Or, if you need year - month to be in order, add this:

ORDER BY openyear, openmonth
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft SQL Server

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.