problem in sql query

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Hello there,

here is i'm obstructed in an sql query...
i've 1 table 'agents_details' like this..

Agent_Id,Agent_Supervisor_Id,Agent_Type

the Agent_Supervisor_Id may contain '0' or 1 value from Agent_Id

I'm having 1 Agent_Id as input and need to find all the Agent_Supervisor_Id in chain..

How can I do that in a query?

here is the details of agents_details table...

+--------+------------+----------------------
|Agent_Id| Agent_Type | Agent_Supervisor_Id |
+--------+------------+----------------------
|   1    | ME         |   0                |   
|   2    | AM         |   0                |    
|   3    | ME         |   2                |     
|   4    | ME         |   0                |    
|   5    | STM        |   7                |    
|   6    | ME         |   5                |   
|   7    | AM         |   0                |    
|   8    | ME         |   7                |    
|   9    | STM        |   5                |

Thanx for Help...

Posted 8-Apr-11 10:16am

DEB4u

Updated 8-Apr-11 10:20am

Wendelius

v2

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Wendelius · Accepted Answer · 2011-04-08T10:27:00

As far as I know MySql isn't capable of handling recursive queries. So one possibility is to create a function (recursive) where you iterate through all the parent records and return for example a string containing all occurences.

Another option could be that if you know the maximum amount of levels you can 'hard-code' it to your statement using self-joins. For example

SELECT ...
FROM agents_details a1
     INNER JOIN agents_details a2 ON a1.Agent_Supervisor_Id = a2.AgentId
     INNER JOIN agents_details a3 ON a2.Agent_Supervisor_Id = a3.AgentId ...

[Addition]
For three levels

SQL

SELECT ...
FROM agents_details a1
     INNER JOIN agents_details a2 ON a1.Agent_Supervisor_Id = a2.AgentId
     INNER JOIN agents_details a3 ON a2.Agent_Supervisor_Id = a3.AgentId
     INNER JOIN agents_details a4 ON a3.Agent_Supervisor_Id = a4.AgentId

Ramu Sangabathula Original · Accepted Answer · 2011-04-08T18:05:00

Create a stored procedure,which takes a parameter agent_id, use cursors to iterate through each record, use the below query select Agent_Supervisor_Id from agent_details where agent_id=parameter, if above collected supervisor id is not equal to zero, iterate through the cursor,

SQL

select @SuperVisorID= Agent_Supervisor_Id  from agent_details where agent_id=parameter
WHILE @@SuperVisorID>0
BEGIN
    //set the above super visor id to a string, prepare a comma separated list of supervisors
   select @SuperVisorID= Agent_Supervisor_Id  from agent_details where agent_id=@@SuperVisorID

END

when you execute the above procedure, given 3 it should return 3,2

then execute some thing like select * from agent_details where agenit_id in (select @aboveProcName)

problem in sql query

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