Question

I can select using or with the sql statement

select f.userid, f.friend_userid from friends f where userid = 1 or friend_userid = 1;

now either userid or friend_userid is returning 1.

i want the two columns i.e userid and friend_userid to get merged

into a single column without 1
such that only one row is displayed…

the output i m getting is…

userid | friend_userid

1 | 2

1 | 7

1 | 5

12|1

24 | 1

I want to get displayed like…

userid

2

7

5

12

24

I m using mysql….

Thanks

Pradyut
India

Answer 1

So, you need the column friend_userid where condition “UserId=1” is met and UserId column when “friend_userid=1” condition is met. Write the following query:

select f.friend_userid as userId from friends f where f.userid = 1 
UNION
select f.userid as userId from friends f where f.friend_userid = 1;

And you get what you wanted.