如何将我的 sql 查询编码为 Laravel 查询

Question

如何将以下 sql 查询转换为 Laravel 查询？

SELECT roster_date, COUNT(DISTINCT truck_id) AS available_units
FROM truck_rosters
WHERE(truck_rosters.status = 'Active')

分组依据 roster_date

并与此查询合并：

SELECT roster_date, COUNT(DISTINCT truck_id) AS total_units 来自 truck_rosters 分组依据 roster_date

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预期结果：

roster_date | total_units | available_units

2019-08-30 | 11 | 3个 2019-08-31 | 10 | 4

Answer 1

对两个计数使用条件聚合：

$rosters = DB::table('truck_rosters')
    ->select(DB::raw("COUNT(DISTINCT truck_id) AS total_units,
        COUNT(CASE WHEN status = 'Active' THEN 1 END) AS active_units, roster_date"))
    ->groupBy('roster_date')
    ->get();