sum集合函数的语法如下: 代码语言:txt 复制 $collection->sum('field'); 其中,$collection表示要进行求和操作的集合,'field'表示要计算总和的字段名。 sum集合函数的优势在于它提供了一种简洁而高效的方式来计算集合中指定字段的总和,避免了手动遍历和累加的繁琐过程。
$result = $collection->groupBy('arrival_date') ->map(function ($row) { $firstRow = $row->first(); return [ 'arrival_date' => $firstRow['arrival_date'], 'total_amount' => $row->sum('total_amount'), 'total_traveller' => $firstRow['total_traveller'], ]; })->values() ->a...
Group by two columns then sum another column within each group with Laravel Eloquent 0 Retrieving a sum of a column with group by clause in LARAVEL 0 Group and sum Laravel collection data by date value of a datetime column 1 Laravel Group By and Sum per grouped rows 0 how...
Laravel Collection是Laravel框架中的一个强大的数据处理工具,它提供了丰富的方法来对集合进行操作和转换。在Laravel Collection中,groupBy()方法用于根据指定的键对集合进行分组。但是,有时候我们可能需要对集合进行分组后,再移除分组的结构,即移除groupBy()之后的集合分组。 为了移除groupBy()之后的集合分组,我们...
The flatMap method iterates through the collection and passes each value to the given callback. The callback is free to modify the item and return it, thus forming a new collection of modified items. Then, the array is flattened by a level:...
The collection instance and the first argument given to the when method will be provided to the closure:$collection = collect([1, 2, 3]); $collection->when(true, function ($collection, $value) { return $collection->push(4); }); $collection->when(false, function ($collection, $value)...
<?phpnamespaceIlluminate\Database\Query;useClosure;useIlluminate\Support\Collection;useIlluminate\Database\ConnectionInterface;useIlluminate\Database\Query\Grammars\Grammar;useIlluminate\Database\Query\Processors\Processor;classBuilder{//methods and variables come here} ...
join 语句 join 语句对数据库进行连接操作,join 函数的连接条件可以非常简单: DB::table('services')->select('*')->join(...
$collection = collect(['taylor', 'abigail', null])->map(function ($name) { return strtoupper($name); })->reject(function ($name) { return empty($name); });As you can see, the Collection class allows you to chain its methods to perform fluent mapping and reducing of the underlying...
数据库驱动程序直接插入原始查询构建器。使用mongodb连接时,您将能够构建流畅的查询来执行数据库操作。为方便起见,还有一个collection别名table以及一些额外的mongodb特定操作符/操作。 $users=DB::collection('users')->get();$user=DB::collection('users')->where('name','John')->first(); ...