CODEWITHSUNDEEP
mysqldatabasedistinct
Karthik
Karthik

Reputation: 3301

How to get the distinct field value in a multiple field in multiple table?

i have a two table x and y. In that x table has x1 as country, x2 as country, y table has y1 as country, y2 has country. For this data, how can i get the distinct country values in this two table with this four country field?

Before that i used a single country in a single table like this,

$query="select distinct(`x1`) from x";

Now, i have the take distinct values in this two table as well as from four country values. For this union is possible. But i need any solution used in a single query without union concept.

Please provide the idea for this. Thanks in Advance...

Upvotes: 0

Views: 163

Answers (3)

KM.
KM.

Reputation: 103697

not the most efficient query ever, but try this:

SELECT `x1` FROM x
UNION 
SELECT `x2` FROM x
UNION 
SELECT `y1` FROM y
UNION 
SELECT `y2` FROM y

Upvotes: 1

user359040
user359040

Reputation:

Union is the best answer to this question, as that's exactly what it's designed for.

The only other method I can think of would be a full outer join - something like:

select coalesce(cx.country,cy.country) country 
from (select distinct country from x) cx
full outer join (select distinct country from y) cy 
on cx.country = cy.country

However, you can't do full outer joins in MYSQL (as far as I know) - and the workarounds involve unions...

Upvotes: 1

MadH
MadH

Reputation: 1508

Idea: use UNION

Upvotes: 1

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