<?php namespace App; use Illuminate\Database\Eloquent\Model; class Flight extends Model { /** * The storage format of the model's date columns. * * @var string */ protected $dateFormat = 'U'; }如果你需要自定义存储时间戳的字段名,可以在模型中设置 CREATED_AT 和UPDATED_AT 常量的值来...
When interacting with Eloquent models, you may also use the count, sum, max, and other aggregate methods provided by the Laravel query builder. As you might expect, these methods return a scalar value instead of an Eloquent model instance:...
where name ='John'or(votes >100andtitle <>'Admin') 你还可以在查询构建器中使用聚合(如count、max、min、avg和sum): $users=DB::table('users')->count();$price=DB::table('orders')->max('price'); 有时,这样的构建器可能不够,或者你可能想要运行原始查询。你也可以将原始查询包装在 Fluent 中...
If you would like to use a "where" style clause on your joins, you may use thewhereandorWheremethods on a join. Instead of comparing two columns, these methods will compare the column against a value: DB::table('users') ->join('contacts',function($join) ...
collect([1, 2, 3, 4, 5])->sum(); // 返回有着指定数量项目的集合: $chunk = $collection->take(3); // 将集合转换成纯 PHP 数组: $collection->toArray(); // 将集合转换成 JSON: $collection->toJson(); // 遍历集合并对集合内每一个项目调用给定的回调函数: $collection->transform(funct...
'select' => "CONCAT('$', FORMAT(SUM((:table).revenue), 2))", )As long as you provide a valid SQL SELECT statement into the select option, you have a lot of power to display your columns however you like.Nested RelationshipsSometimes...
GROUP BY是 SQL 中的一个子句,用于将查询结果按照一个或多个列进行分组。这对于执行聚合函数(如 COUNT, SUM, AVG, MAX, MIN)非常有用,因为它允许你对每个组分别计算这些值。 相关优势 简化复杂查询:使用GROUP BY可以减少需要编写和维护的 SQL 语句的数量。
共5个: count 计数 sum 求和 avg 求平均 max 求最大值 min 求最小值注意事项:1、分组函数自动忽略null,不需要对null进行提前处理。2、分组函数中count* 与count具体字段不同,count(具体字段)该字段下不为null的元素的总数,count*为统计所有行 分组函数 字段 最小值 转载 小屁孩 2023-06-02 08:45:04...
查询构建器还提供了多种检索聚合值的方法,例如 count, max, min,avg和sum。你可以在构建查询后调用这些方法中的任何一个:use Illuminate\Support\Facades\DB;$users = DB::table('users')->count();$price = DB::table('orders')->max('price');当然,你可以将这些方法与其他子句结合起来,以优化计算聚合...
1Route::get('/api/flights/{id}', function ($id) { 2 return App\Flight::findOrFail($id); 3});Retrieving AggregatesOf course, you may also use count, sum, max, and other aggregate functions provided by the query builder. These methods return the appropriate scalar value instead of a ...