Question

Table1
user,city

Table2
user,friends

I want to select * from Table1 for one specific user and all his friends (who are also users in Table1).

Tried this and it found all data but gave multiple rows for WHERE Table1.user = '$user' even though every username is unique.

SELECT *
FROM Table1, Table2
WHERE Table1.user = '$user'
OR
(Table2.user = '$user' and Table2.friends = Table1.user)

Many thanks

Answer 1

You essentially have two different queries (select user 1’s info, select user 1’s friends’ info). You can combine them with a UNION.

SELECT
  table1.user,
  table1.city
FROM
  table1
INNER JOIN
  table2
ON
  table1.user = table2.friends
WHERE
  table2.friends = '$user'

UNION

SELECT
  user,
  city
FROM
  table1
WHERE
  user = '$user'