连接两个表时出现Laravel 5.4错误

Question

I need to join two tables in laravel model. Here is my query,

 $id="1002"; 
 $resultsInCalls =  DB::table('qlog')
    ->select('user_master.fname','user_master.lname','qlog.data2')
    ->whereDate('created', '=', date('Y-m-d'))    // this day

    ->join('qlog', 'qlog.agent', '=', 'user_master.sip_id')
    ->where('agent', '=', $id)   
    ->where(function ($query) {
        $query->where('event', '=', 'COMPLETEAGENT')
           ->orWhere('event', '=', 'COMPLETECALLER');
         }) 
    ->take(5)
    ->get();  

But I run this query I get following error.

SQLSTATE[42000]: Syntax error or access violation: 1066 Not unique table/alias: 'qlog' (SQL: select `user_master`.`fname`, `user_master`.`lname`, `qlog`.`data2` from `qlog` inner join `qlog` on `qlog`.`agent` = `user_master`.`sip_id` where date(`created`) = 2017-11-29 and `agent` = 1002 and (`event` = COMPLETEAGENT or `event` = COMPLETECALLER) limit 5) 

I read related questions. But I can't figure it out. How to fix this error.

Answer 1

Here I get it done,

 $resultsInCalls =  DB::table('qlog')
        ->join('user_master as user_table', 'qlog.agent', '=', 'user_table.sip_id')
        ->select('user_table.fname','user_table.lname','qlog.data2')
        ->whereDate('created', '=', date('Y-m-d'))    // this day
        ->where('agent', '=', $id)   
        ->where(function ($query) {
            $query->where('event', '=', 'COMPLETEAGENT')
               ->orWhere('event', '=', 'COMPLETECALLER');
             }) 
        ->take(5)
        ->get();