下面由Laravel教程欄目帶大家介紹關于Laravel joinSub的使用，希望對大家有所幫助！

我有個語句，想著以為 join 子查詢不支持改成模型查詢的寫法呢，百度了下，發現有 joinSub 的語法，在下孤陋寡聞了，特此記錄

以下語句目的是，取全表最新日期的那條（相同字段中有重復時，只取最新）
表字段大寫不是我定的~我只是查詢使用者

        $resultIds = DB::connection('fund')->select(" SELECT  t1.InvestAdvisorCode FROM  table t1  INNER JOIN ( SELECT SUBSTRING_INDEX( group_concat( id ORDER BY EndDate DESC ), ',', 1 ) AS id FROM table t2 GROUP BY InvestAdvisorCode ) t2 ON t1.id = t2.id order by t1.TotalFundNV desc ");

      $subQuery = Table::query()             ->selectRaw("SUBSTRING_INDEX( group_concat( id ORDER BY EndDate DESC ), ',', 1 ) AS id")             ->from('table as t2')             ->groupBy('InvestAdvisorCode')             ->getQuery();          $resultIds=Table::query()             ->from('table as t1')             ->joinSub($subQuery,'t2','t1.id','=','t2.id')             ->orderBy('t1.TotalFundNV','desc')             ->pluck('InvestAdvisorCode')->toArray()