Question

我有两个要合并的表，将它们合并后，我要通过在联合中使用的一列进行分组

这是我尝试的内容：

$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();

这是我尝试过的MySQL查询

"(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"

我在MySQL中真正想要的是这样的：

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

感谢您的帮助

Answer 1

//尝试这个示例，它将为您提供帮助

$ query1 = DB :: table（'table1'）-> where（....）;

$ query2 = DB :: table（'table2'）-> where（....）;

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

如何与Laravel中的工会分组

1 个答案: