1.直接上圖，如下是查詢的原生sql：
1 EXPLAIN SELECT 2 `erp_agents`.`company_id` 3 FROM 4 `erp_agents` FORCE INDEX (`test`) 5 LEFT JOIN `erp_positions` ON `erp_positions`.`id` = `erp_agents`.`position_id` 6 WHERE 7 `erp_agents`.`status` IN ('預離職', '正常') 8 AND `worked_at` <= '2018-09-30 23:59:59'
9 AND `is_suppose` = '0'
10 AND `erp_agents`.`company_id` = '2'
11 AND `erp_agents`.`deleted_at` IS NULL
12 AND `erp_agents`.`company_id` = '2'
2.在laravel的代碼里面需要這樣寫，如下圖：
在這里用when方法來判斷此索引是否存在，日過不存在的話就不用這個索引，不然會報錯，避免有人誤刪索引后，導致系統報錯。
此處強制索引的語句是：
->from(DB::raw('`erp_agents` FORCE INDEX (`test`)'))
$agents = Agent::where($whereType) ->when(hasIndex('Agent', 'test'),function ($q){ $q->from(DB::raw('`erp_agents` FORCE INDEX (`test`)')); }) ->when(request('position',false),function ($q){ $q->whereIn('position_id',request('position')); }) ->whereIn('agents.status', $validStatus) ->where('worked_at', '<=', $end) ->where('is_suppose', 0) ->addDomination('m.statistics-human-view') ->leftJoin('positions', 'positions.id', '=', 'agents.position_id') ->get(['worked_days', 'worked_at']);
over！
轉發請注明出處！