在上面的示例中,我们首先创建了一个子查询$subQuery,它选择了table1表中的column1列,并使用where子句过滤了column2的值为value的行。 然后,我们创建了一个主查询$query,它选择了table3表中的column3列,并使用where子句过滤了column4的值为value的行。此外,我们还使用了whereIn方法,将column5的值限制...
'=', 'value'); $query = DB::table('table3') ->select('column3') ->where('column4', '=', 'value') ->whereIn('column5', function ($query) use ($subQuery) { $query->selectSub($subQuery, 'subquery_alias'); }); $results = $query->get(); ...
在上面的示例中,我们首先创建了一个子查询$subQuery,它从users表中选择id列,并且只选择active字段为1的记录。然后,我们在主查询中使用whereIn方法,将子查询的结果作为条件来过滤orders表中的记录。 3. 掌握如何在 Laravel 中使用子查询来过滤结果 除了whereIn之外,Laravel还提供了其他方法来在查询中使用子查询,如whe...
Subquery Where ClausesSometimes you may need to construct a "where" clause that compares the results of a subquery to a given value. You may accomplish this by passing a closure and a value to the where method. For example, the following query will retrieve all users who have a recent "...
Subquery JoinsYou may use the joinSub, leftJoinSub, and rightJoinSub methods to join a query to a subquery. Each of these methods receives three arguments: the subquery, its table alias, and a closure that defines the related columns. In this example, we will retrieve a collection of ...
The query above will produce the following SQL:1select * from users 2where exists ( 3 select 1 from orders where orders.user_id = users.id 4)Subquery Where ClausesSometimes you may need to construct a where clause that compares the results of a subquery to a given value. You may ...
Subquery JoinsYou may use the joinSub, leftJoinSub, and rightJoinSub methods to join a query to a subquery. Each of these methods receive three arguments: the subquery, its table alias, and a Closure that defines the related columns:$latestPosts = DB::table('posts') ->select('user...
注意这里是怎么使用 Eloquent 来生成的子查询。这样的语法更好,更具有直观表现力。同样的,你也可以使用 query builder: returnDestination::addSelect(['last_flight'=>function($query){$query->select('name') ->from('flights') ->whereColumn('destination_id','destinations.id') ...
We can add subquery or “custom column” in select with first argument of \Illuminate\Database\Query\Builder::selectSub method as raw SQL or Closure , or \Illuminate\Database\Query\Builder .更好的解决方案是 关闭 或Builder 。在您的情况下,它将是:$...
使用Query Builder 如果你不想使用 Eloquent ORM,也可以直接使用 Query Builder 来实现子查询求和: 代码语言:txt 复制 $subQuery = DB::table('order_items') ->selectRaw('order_id, SUM(amount) as total_amount') ->groupBy('order_id'); $totalAmount = DB::table(DB::raw("({$subQuery->toSql()...