[英]laravel join with only limiting 2 row
so i having this kind of query where i do grouping with max date/period like this所以我有这种查询,我像这样用最大日期/时间段进行分组
$table_data = App\salesreport::join(DB::RAW('(SELECT company_id, MAX(period) AS max_period FROM salesreport GROUP BY company_id ) latest_report'),function($join){
$join->on('salesreport.company_id','=','latest_report.company_id');
$join->on('salesreport.periods','=','latest_report.max_periods');
})->get()
and it work just fine, it can group all company into one and then showing only the latest one MAX(period)
.它工作得很好,它可以将所有公司归为一个,然后只显示最新的一个MAX(period)
。 And then i want to tweak it more, how about if i want to show not only the latest one, but also the latest two of each company?然后我想对其进行更多调整,如果我不仅要展示最新的,还要展示每家公司的最新两个怎么样? so each company will returning 2 report that is the latest of all report.所以每家公司将返回所有报告中最新的 2 份报告。
and then i think maybe adding LIMIT 2
will make it works so i put it like this然后我想也许添加LIMIT 2
会使它起作用所以我这样说
$table_data = App\salesreport::join(DB::RAW('(SELECT company_id, MAX(period) AS max_period FROM salesreport GROUP BY company_id ) latest_report'),function($join){
$join->on('salesreport.company_id','=','latest_report.company_id');
$join->on('salesreport.periods','<=','latest_report.max_periods');
$join->limit(2)
})->get()
but it has no effect and just showing all report of all company which have period <= max_periods.但它没有效果,只显示所有周期 <= max_periods 的公司的所有报告。
to make things more clearer here is my table that i do joining为了让事情更清楚这里是我加入的表
so here is my sales report table这是我的销售报告表
+----+------------+-------+------------+
| id | company_id | price | periods |
+----+------------+-------+------------+
| 1 | A1 | 500 | 2016-07-12 |
| 2 | A2 | 540 | 2017-01-21 |
| 3 | A1 | 440 | 2017-01-19 |
| 4 | A1 | 440 | 2018-01-19 |
| 5 | A2 | 330 | 2016-01-12 |
| 6 | A2 | 333 | 2018-01-22 |
+----+------------+-------+------------+
and then using the first query up there then i will get this kind of table然后在那里使用第一个查询然后我会得到这种表
+----+------------+-------+------------+
| id | company_id | price | periods |
+----+------------+-------+------------+
| 4 | A1 | 440 | 2018-01-19 |
| 6 | A2 | 333 | 2018-01-22 |
+----+------------+-------+------------+
so what i want is to get this kind of table所以我想要的是得到这种桌子
+----+------------+-------+------------+
| id | company_id | price | periods |
+----+------------+-------+------------+
| 4 | A1 | 440 | 2018-01-19 |
| 3 | A1 | 440 | 2017-01-19 |
| 6 | A2 | 333 | 2018-01-22 |
| 2 | A2 | 540 | 2017-01-21 |
+----+------------+-------+------------+
so the latest 2 of all for each company.. is it possible?所以每家公司的最新 2 个.. 有可能吗? with only one request?只有一个请求?
Using this trick :使用这个技巧:
App\salesreport::join(DB::RAW('(SELECT company_id, GROUP_CONCAT(periods ORDER BY periods DESC) grouped_periods FROM salesreport GROUP BY company_id ) latest_report'),function($join){
$join->on('salesreport.company_id','=','latest_report.company_id');
$join->whereBetween(DB::raw('FIND_IN_SET(`salesreport`.`periods`, `latest_report`.`grouped_periods`)'), [1, 2]);
})->get();
Using this trick :使用这个技巧:
App\salesreport::join(DB::RAW('(SELECT company_id, GROUP_CONCAT(periods ORDER BY periods DESC) grouped_periods FROM salesreport GROUP BY company_id ) latest_report'),function($join){
$join->on('salesreport.company_id','=','latest_report.company_id');
$join->whereBetween(DB::raw('FIND_IN_SET(`salesreport`.`periods`, `latest_report`.`grouped_periods`)'), [1, 2]);
})->get();
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