?
Solved

Sorting a union select statement?

Posted on 2011-09-07
11
Medium Priority
?
221 Views
Last Modified: 2012-06-27
Hello experts.  Hoping for some help. My Statement below isn't working.

SELECT DISTINCT State
FROM         cities
WHERE     (Country = 'Canada')
Order By State
UNION
SELECT DISTINCT State
FROM         cities
WHERE     (Country = 'us')
Order by State

What I am trying to do is have all of the Canadian provinces listed FIRST, alphabetized, followed by all the US states, alphabetized.  Maybe Union is the wrong way to go?

0
Comment
Question by:arthurh88
  • 4
  • 2
  • 2
  • +2
11 Comments
 
LVL 9

Expert Comment

by:AriMc
ID: 36499206
Try this:

SELECT DISTINCT state
FROM cities
WHERE (Country = 'Canada') OR (Country = 'us')
ORDER BY Country, State
0
 
LVL 18

Expert Comment

by:lludden
ID: 36499302
Or
SELECT DISTINCT state
FROM cities
WHERE Country IN ('Canada','us')
ORDER BY Country, State

I like to use IN rather than OR in case you add other conditions you don't have to worry about grouping conditions.
0
 

Author Comment

by:arthurh88
ID: 36499304
no go.  I got this error:  ORDER BY items must appear in the select list if SELECT DISTINCT is specified.
0
The 14th Annual Expert Award Winners

The results are in! Meet the top members of our 2017 Expert Awards. Congratulations to all who qualified!

 
LVL 38

Expert Comment

by:Gerwin Jansen, EE MVE
ID: 36499363
@AriMc - I don't think your order by will work because Country is not in the selection

Try this:

select State from
(
  select distinct State, Country
  from cities
  where Country in ('Canada','us')
  order by Country, State
)
0
 
LVL 9

Expert Comment

by:AriMc
ID: 36499441
@gerwinjansen - That probably depends on the DB-engine. Your query seems to give errors regarding unambiguous aliases. This one works at least in MySQL:

select ns.State from
(
  select distinct State, Country
  from cities
  where Country in ('Canada','us')
  order by Country, State
)  ns

0
 
LVL 38

Expert Comment

by:Gerwin Jansen, EE MVE
ID: 36499480
@AriMc - OK :)

@arthurh88 - last one working for you?
0
 
LVL 61

Expert Comment

by:Kevin Cross
ID: 36499488
You should use a CASE statement in the ORDER BY.
0
 
LVL 61

Expert Comment

by:Kevin Cross
ID: 36499511
Try like this:

SELECT DISTINCT [State]
FROM cities
ORDER BY CASE [Country] WHEN 'Canada' THEN 0 ELSE 1 END, [State]

Open in new window


And you may want to look at GROUP BY as you may want the [Country] involved in case you are using the abbreviations for states as I believe there is at least AL that conflicts.

SELECT [State]
FROM cities
-- WHERE [Country] IN ('Canada', 'US') 
GROUP BY [Country], [State]
ORDER BY CASE [Country] WHEN 'Canada' THEN 0 ELSE 1 END, [State]

Open in new window


Uncomment the WHERE clause if you have other countries in your cities table.
0
 
LVL 61

Accepted Solution

by:
Kevin Cross earned 2000 total points
ID: 36499518
Oh, and first query would work also if you use GROUP BY. I over "thunk" it since 'Canada' alphabetically sorts before 'US' anyway, you don't really need the CASE.

Change http:#a36499206 to:
SELECT [State]
FROM cities
WHERE [Country] IN ('Canada', 'US') 
GROUP BY [Country], [State]
ORDER BY [Country], [State]
;

Open in new window


Hope that helps!
0
 

Author Closing Comment

by:arthurh88
ID: 36499709
yes this one worked!

I tried

SELECT     State
FROM         (SELECT DISTINCT TOP (100) PERCENT State, Country
                       FROM          cities
                       WHERE      (Country IN ('Canada', 'us'))
                       ORDER BY Country, State) AS derivedtbl_1

but it did not work, it mixed US and Canadian states together.
0
 
LVL 61

Expert Comment

by:Kevin Cross
ID: 36499775
Yes, sort in a view which the derived table is acting like doesn't really guarantee sorting on the outer query. It is the reason why sorting views is useless. Glad that helped.

Best regards and happy coding,
Kevin
0

Featured Post

Learn to develop an Android App

Want to increase your earning potential in 2018? Pad your resume with app building experience. Learn how with this hands-on course.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article describes how to use the timestamp of existing data in a database to allow Tableau to calculate the prior work day instead of relying on case statements or if statements to calculate the days of the week.
One of the most important things in an application is the query performance. This article intends to give you good tips to improve the performance of your queries.
With just a little bit of  SQL and VBA, many doors open to cool things like synchronize a list box to display data relevant to other information on a form.  If you have never written code or looked at an SQL statement before, no problem! ...  give i…
SQL Database Recovery Software repairs the MDF & NDF Files, corrupted due to hardware related issues or software related errors. Provides preview of recovered database objects and allows saving in either MSSQL, CSV, HTML or XLS format. Ensures recov…

588 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question