Question

我正在尝试显示具有相同名称的收集和发布的血液表条目的数量。

我有一张这样的表

Blood Collection
--------------------------------------
id   BloodComponent      Remarks
1    Whole Blood         Collected
2    Platelet            Released
3    Plasma              Collected
4    Platelet            Released
5    Plasma              Collected
6    Whole Blood         Released

我希望输出类似于：

Name         Collected       Released
---------------------------------------
Whole Blood      1              1
Platelet         0              2
Plasma           2              0

我使用laravel作为框架...

Answer 1

当您要求行成为数据列时，您将使用交叉表查询转换行：

SELECT `BloodComponent` AS `Name`,
SUM(IF(`Remarks` = 'Collected', 1, 0)) AS `Collected`,
SUM(IF(`Remarks` = 'Released', 1, 0)) AS `Released`
FROM `BloodCollection`
GROUP BY `BloodComponent`

这是一个informative post，以更详细的方式展示了这些类型的查询。

在Laravel：

DB::table("BloodCollection")
  ->selectRaw("`BloodComponent` AS `Name`,SUM(IF(`Remarks` = 'Collected', 1, 0)) AS `Collected`,SUM(IF(`Remarks` = 'Released', 1, 0)) AS `Released`")
  ->groupBy("BloodComponent")
  ->get();

Answer 2

在laravel：

$results = DB::table("BloodCollection")
  ->selectRaw("BloodComponent AS Name,SUM(IF(Remarks = 'Collected', 1, 0)) AS Collected,SUM(IF(Remarks = 'Released', 1, 0)) AS Released")
  ->groupBy("BloodComponent")
  ->get();

或者如果您已经拥有BloodCollection型号：

$results = BloodCollection::selectRaw("BloodComponent AS Name,SUM(IF(Remarks = 'Collected', 1, 0)) AS Collected,SUM(IF(Remarks = 'Released', 1, 0)) AS Released")
  ->groupBy("BloodComponent")
  ->get();

然后：

foreach($results as $result){

    echo $results->Name . ": ".$results->Collected ." collected, ".$results->Released ." released.";

}

显示收集和释放血液成分的计数

2 个答案: