laravel中groupBy使用笔记!

$goods_id = 34;
//商品sku规格值表
//关联规格表取规格名
//关联规格值表取规格值
                  $spec_res = $this->specIndexModel
                      ->select('goods_spec_index.spec_id','goods_spec_index.spec_value_id',
'goods_spec.spec_title','goods_spec_values.spec_value')
                      ->join('goods_spec','goods_spec.spec_id','=','goods_spec_index.spec_id')
                      ->join('goods_spec_values','goods_spec_values.spec_value_id','=','goods_spec_index.spec_value_id')
                      ->whereRaw("goods_id = {$goods_id}")
                      ->orderBy('goods_spec.spec_id','desc')
                      ->groupBy('goods_spec_index.spec_id','goods_spec_index.spec_value_id')
                      ->get()
                      ->toArray();

报错如下：

解决方法：config下database.php里strict改成false

// 'strict' => true,
            'strict' => false,//改成false解决groupBy报错问题

未分组情况下，重复数据

groupBy('goods_spec_index.spec_id') //只按规格名的id分组

groupBy('goods_spec_index.spec_id') //只按规格值的id分组

groupBy('goods_spec_index.spec_id','goods_spec_index.spec_value_id')//按规格名和值的id一起分组