Select non duplicate records in one column only

Question

1.00/5 (2 votes)

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I want only distinct values in one cloumn other columns can contain duplicate values,how do I achieve this

SQL

create table test
(
    Id int,
    Name varchar(max),
    Department varchar(max),
    Country varchar(max)
)
insert into test values (1,'B','IT','India')
insert into test values (2,'B','IT','US')
insert into test values (3,'C','HR','UK')
insert into test values (4,'D','HR','India')
insert into test values (5,'E','IT','US')
insert into test values (6,'F','IT','UK')
select * from test

I just want the non duplicate values in country column.
select id,country from test group by country FAILED
select id,country distinct from test FAILED

Posted 18-Jun-13 6:49am

Member 9176543

Updated 18-Jun-13 7:03am

Ron Beyer

v2

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Zoltán Zörgő 18-Jun-13 14:05pm

Ok, but what about the rest - what about the other column values? What result do you expect?
You have two "US" there. You want a single one. Great. And what will be the "unification" result in your case:
a) 2,'B','IT','US'?
b) 5,'E','IT','US'?
c) 2+5, 'BE', 'ITIT', 'US'?
d) ?????
"other columns can contain duplicate values" makes no sense. If you want a single row, a field can contain only one value.

You gave us a sample input. Please, give us also the desired result based on that input.

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mgoad99 · Accepted Answer · 2013-06-18T10:28:00

The group by approach would work, but you need to decide what you want to see with the other columns. All columns not in the group by clause need to have some kind of aggregate function (max, min, avg etc)

an example of how to write the group by would be something like this:

select max(id), country
from test
group by country