如何在laravel与union进行分组

我有两个要合并的表，合并后，我想按我在联合中使用的一列进行分组

以下是我尝试过的：

这是我尝试的MySQL查询

我在MySQL中真正想要的是这样的：

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谢谢你的帮助

//试试这个例子，它会对你有所帮助

$query1=DB:：table（'table1'）->其中（…）

$query2=DB:：table（'table2'）->其中（…）

$data=DB:：select（DB:：raw（'id，MAX（created_at）as MAX_created_at'）>union（$query1）->union（$query2）->orderBy（'MAX_created_at'）->groupBy（'id'）->get（）

$issuance = DB::table('issuance as i')
            ->select('i.issue_to as stud_id', 'i.created_on');

$stud= DB::table('transfer as t')
            ->select('t.transfer_to as stud_id', 't.created_on')
            ->union($issuance)
            ->select('stud_id', 'created_on', DB::raw('COUNT(*) as total_asset'))
            ->groupBy('stud_id')
            ->orderBy('created_on', 'DESC')->get();

"(select `stud_id`, `created_on`, COUNT(*) as total_asset from `transfer` as 
`t` group by `stud_id`) union (select `i`.`issued_to` as `stud_id`, `i`.`created_on` from 
`issuance` as `i`) order by `created_on` desc"

select stud_id, count(*) from ((select `t`.`transfered_to` as `stud_id`, 
`t`.`created_on` from `transfer` as `t`) union (select `i`.`issued_to` as 
`stud_id`, `i`.`created_on`, COUNT(*) as asset from `issuance` as `i`)) as t 
group by stud_id order by `created_on` desc