How to write this self join based on three columns Hello there I have a following table

------------------------------------------
| id | language | parentid | no_daughter |
------------------------------------------
| 1  |     1    |    0     |      2      |
------------------------------------------
| 1  |     1    |    0     |      2      |
------------------------------------------
| 2  |     1    |    1     |      1      |
------------------------------------------
| 2  |     2    |    1     |      1      |
------------------------------------------
| 3  |     1    |    1     |      0      |
------------------------------------------
| 3  |     2    |    1     |      0      |    
------------------------------------------
| 4  |     1    |    2     |      0      |
------------------------------------------
| 4  |     2    |    2     |      0      |
------------------------------------------
| 5  |     1    |    2     |      0      |
------------------------------------------
| 5  |     2    |    2     |      1      |
-----------------------------------------
| 5  |     1    |    4     |      1      |
------------------------------------------
| 5  |     2    |    4     |      1      |
------------------------------------------


Scenario

Every record has more than one rows in table with different language ids. parentid tells who is the parent of this record. no_daughter columns tells against each record that how many child one record has. Means in Ideal scenario If no_daughter has value 2 of id = 1 , it means 1 should be parentid of 2 records in same table. But If a record has more than one exitance with respect to language, it will be considered as one record. 

My Problem

I need to find out those records where no_daughter value is not correct. It means if no_daughter is 2, there must be two records whoes parentid has that id. In above case record with id = 1 is valid. But record having id = 2 is not valid because the no_daughter = 1 but actual daughter of this record is 2. Same is the case with id=4

Can any body tell me how can I find these faulty records?

So far help received

SELECT DISTINCT 
id 
FROM
tbl_info t 
INNER JOIN 
  (SELECT 
    parentid,
    COUNT(DISTINCT id) AS childs 
  FROM
    tbl_info 
  GROUP BY parentid) AS parentchildrelation 
  ON t.id = parentchildrelation.parentid 
  AND t.no_daughters != parentchildrelation.childs 


This query is returning those ids who have been used as parentid somewhere in table but having wrong no_daughter values. But not returning ids that has value in no_daugter columns but have not been used as parentid any where in table. For exampl id = 5 has no_daughter = 1 but it is not used as parentid in table. So it is also a faulty record. But above query is not capturing such records.

Any help will be much appreciated.
The problem with your provided query is that you're doing an INNER JOIN. Because there are no rows with a parentid of 5, the subquery would return NULL on those rows and be excluded. 

What you want is a LEFT JOIN, something like this (sqlfiddle):

SELECT t.*, parentchildrelation.parentid, childs
FROM tbl_info t
LEFT JOIN 
  (SELECT 
    parentid,
    COUNT(DISTINCT id) AS childs 
  FROM
    tbl_info  
  GROUP BY parentid) AS parentchildrelation 
  ON t.id = parentchildrelation.parentid 
WHERE t.no_daughter != parentchildrelation.childs 
   OR (t.no_daughter &gt; 0 AND parentchildrelation.parentid IS NULL)
GROUP BY t.id, t.parentid;


I included more columns, because where id=5 and parentid=2 has two different values for no_daughter. You should be able to adjust those as needed.