Use SUM() inside of selectRaw() method calls when you wish to COUNT bya condition -- this offers a concise syntax because it is not necessary to explicitly write CASE or IF expressions. Code: (PHPize Demo) var_export( $db::table('orders') ->selectRaw("COUNT(1) count") ->selectRaw(...
foreach ($posts as $post) { echo $post->comments_count; } 这样,我们就可以在Laravel中使用withCount方法并添加条件来获取关联模型的数量了。 推荐的腾讯云相关产品:腾讯云服务器(CVM)和腾讯云数据库(TencentDB)。 腾讯云服务器(CVM)是一种弹性计算服务,提供可扩展的云服务器实例,适用于各种应用场景。您可以...
在 Eloquent 模型上进行关联查询主要分为两种方式,一种是懒惰式加载(动态属性),一种是渴求式加载(通过with方法)。从性能上来说,渴求式加载更优,因为它会提前从数据库一次性查询所有关联数据,而懒惰式加载在每次查询动态属性的时候才会去执行查询,会多次连接数据库,性能上差一些(数据库操作主要开销在数据库连接上,...
使用goupby和count的Laravel查询 如何使用tmap的函数:sum和count 如何在sqlAlchemy模型的联接查询中使用sum和count Laravel和Angular。当我使用Postman和Chrome进行搜索时,Laravel的查询结果出现问题 Joined to SQL中的Distinct Count和SUM子查询 使用sum(x-y)、count(<condition>)和group对实体框架核心进行sql查询 ...
@if (count($students) === 1) 操场上只有一个同学 @elseif (count($students) === 0) 操场上一个同学也没有 @else 操场上有 {{ count($students) }} 个同学 @endif # 表示和 @if 条件相反的条件 @unless ($user->hasPaid()) 用户没有支付 ...
Article::find($article_id)->increment('read_count', 10); // +10 Product::find($produce_id)->decrement('stock'); // -1 我们来看看源代码是怎么实现的: /** * Increment a column's value by a given amount. * * @param string $column ...
when you use Count or withCount method, the query builder does a select count(id) as aggregate if in the condition par of the withCount you override the select part. it breaks return $q->withCount(['users' => function($q) { //here you are supposed to do condition, not a select $q-...
# 批量查询字段涉及update,使用chunkById($count, $callback, $coulumn, $alias)处理,避免chunk漏数据 $refundAll = OrderTrace::where('pay_status', 2) ->where('order_type', 0) ->where('order_status', 1) ->where('pay_channel', 2) ...
I am also trying to get a count of relation table and need to make a condition on that count with having an aggregate function but not able to achieve with pagination. Then I will find the alternate option with WhereHas but that is not a proper way to do it. ...
orWhereHas(string $relation, Closure $callback = null, string $operator = '>=', int $count = 1) Add a relationship count / exists condition to the query with where clauses and an "or". from QueriesRelationships Builder|QueriesRelationships whereDoesntHave(string $relation, Closure $call...