Question

I have one table, example

catid | parentcatid | dirname
  4   |      0      | mobiles 
 243  |      4      | Nokia

When I get catid = 243 I need to take with mysql_query (catid=parentcatid)

243 | mobiles | Nokia

I can first select catid, parentcatid, and dirname where id=243 and then select the same where parentcatid = catid, but

How to make this single query ?

Answer 1

JOIN the table twice:

SELECT
  t2.catid, t1.dirname 'dirname', t2.dirname 'parentname'
FROM Tablename t1
INNER JOIN Tablename t2 ON t1.catid = t2.parentcatid
WHERE t2.catid = 243;

SQL Fiddle Demo

This will give you:

| CATID | DIRNAME | PARENTNAME |
--------------------------------
|   243 | mobiles |      Nokia |