laravel利用subquery使左连接查询右表数据唯一查询 如:表a,连接表b,b中有多条符合查询的记录 1、建立需要的子查询 $sub = DB::table('b')->select(['aid'])->selectRaw('max(id) as id')->grouBy('id'); 2、建立连接查询 $_list = DB::table('a')->leftJoin(DB::raw('({$sub->toSql()...
$subQuery = Order::select(DB::raw('orders.user_id, COUNT(*) AS cnt')) ->leftJoin('users', 'orders.user_id', '=', 'users.id') ->where('users.created_at', '>=', $created_at_s) ->where('users.created_at', '<=', $created_at_e) ->groupBy('orders.user_id') ->having...
I'm trying to add a left join to this query I've been using to get nPerGroup of related records. I've created the query in SQL just don't know how to convert it to Laravel query builder code. The reason I want to add a left join is for performance pu
子查询 join 带来的问题 关于误解 一直认为,如果在查询时,如果能把各个表的通过子查询限制在一定范围内再关联性能会更好,可是忽略了一个事实,就是子查询的结果存储成临时表,不再使用索引,如果对于一个年数据在千万量级的两个表进行关联,即使求单月内的数据限制时间变成了百万级的表,而子查询连之后是O(N*M)...
DB::table('users') ->join('contacts', function (JoinClause $join) { $join->on('users.id', '=', 'contacts.user_id') ->where('contacts.user_id', '>', 5); }) ->get();Subquery JoinsYou may use the joinSub, leftJoinSub, and rightJoinSub methods to join a query to a ...
Subquery JoinsYou may use the joinSub, leftJoinSub, and rightJoinSub methods to join a query to a subquery. Each of these methods receives three arguments: the subquery, its table alias, and a closure that defines the related columns. In this example, we will retrieve a collection of ...
Subquery JoinsYou may use the joinSub, leftJoinSub, and rightJoinSub methods to join a query to a subquery. Each of these methods receive three arguments: the subquery, its table alias, and a Closure that defines the related columns:$latestPosts = DB::table('posts') ->select('user...
如何在Laravel 5的join子句中结合raw查询实现复杂条件连接? 在laravel5的join子句中使用raw查询,可以通过使用DB类的select方法和join方法来实现。 首先,使用DB类的select方法来指定需要查询的字段,可以使用raw方法来构建原始查询语句。例如,如果需要查询users表和orders表中的数据,并且在join子句中使用raw查询,可以按照...
1DB::table('users') 2 ->join('contacts', function (JoinClause $join) { 3 $join->on('users.id', '=', 'contacts.user_id') 4 ->where('contacts.user_id', '>', 5); 5 }) 6 ->get();Subquery JoinsYou may use the joinSub, leftJoinSub, and rightJoinSub methods to join a ...
1DB::table('users') 2 ->join('contacts', function ($join) { 3 $join->on('users.id', '=', 'contacts.user_id') 4 ->where('contacts.user_id', '>', 5); 5 }) 6 ->get();Subquery JoinsYou may use the joinSub, leftJoinSub, and rightJoinSub methods to join a query to ...