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SQL - Join to columns as one

Posted on 2011-09-16
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375 Views
Last Modified: 2012-05-12
My current SQL statement is this:
SELECT DISTINCT home_nation, company_nation
FROM jos_users

which returns to me two columns with a listing of countries:

What I want to do is only have my SQL statement return one column of unique columns. So for example:

current return:

home_nation        company_nation
Australia
Canada
                              Canada
                              Bermuda
United Kingdom
                              Australia




Return I want:

unique_nation
Australia
Canada
Canada
Bermuda
United Kingdom
Australia


Thanks for any help!

0
Comment
Question by:elliottbenzle
7 Comments
 
LVL 5

Expert Comment

by:magento
ID: 36549842

Try this.

    SELECT home_nation + ' ' + company_nation AS unique_nation
    FROM jos_user

Open in new window

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LVL 21

Expert Comment

by:JestersGrind
ID: 36549890
If there is always one entry in one of the two columns, you could do something like this.

SELECT CASE WHEN home_nation = '' THEN company_nation ELSE home_nation END AS unique_nation
FROM jos_user

Greg

0
 
LVL 51

Expert Comment

by:HainKurt
ID: 36549962
try:

select distinct country from (
  SELECT DISTINCT home_nation Country FROM jos_users
  UNION
  SELECT DISTINCT company_nation FROM jos_users
)
0
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LVL 51

Expert Comment

by:HainKurt
ID: 36549978
What I want to do is only have my SQL statement return one column of unique columns

and

Return I want:

unique_nation
Australia
Canada
Canada
Bermuda
United Kingdom
Australia

contradicts... you should say


Return I want:

unique_nation
Australia
Canada
Bermuda
United Kingdom
Australia

which I posted above...
0
 
LVL 5

Accepted Solution

by:
magento earned 500 total points
ID: 36549983
Tested the below solution.

select concat(home_nation,company_nation) uniq from jos_users
0
 
LVL 142

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 36550046
or, if its really "NULL" in either column, you could use COALESCE(home_nation, company_nation) ...
0
 
LVL 4

Author Closing Comment

by:elliottbenzle
ID: 36550209
Thanks, that did the trick.
0

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