To explain the structure of the table
- The main table (Orders table) order data
| ord_id | order_sn |
| 1 | EX2019100123458 |
Wherein order_id primary key (order id)
- Child table (table tickets) order_item data
| ord_ite_id | ord_id | exhibit_sn | type |
| 1 | 1 | EXSN20191001001 | 1 |
| 2 | 1 | EXSN20191001002 | 1 |
| 3 | 1 | EXSN20191001003 | 1 |
Between the main table and the child tables by associating ord_id
Implementation: by type (type of ticket) by the child table query order number in the primary table
The first attempt:
select DISTINCT `order`.ord_id from `order` INNER JOIN order_item on order.ord_id = order_item.ord_id where type = 1;
This method can be achieved, but if you want to page, then use laravel in need so
DB::table(DB::raw("sql语句"))->paginate(15);
But then our native sql statement is equivalent to use, but if you add conditions, then it can only go splicing sql statement
The second attempt:
select `order`.ord_id,`order`.order_sn from `order` INNER JOIN (select distinct ord_id from order_item) r on `order`.ord_id=r.ord_id
In use in larave
Order::join(DB::raw("(select distinct order_item.ord_id item_ord_id,type from order_item) ".env("DB_PREFIX")."bb"),"bb.item_order_id","exhibit_order.order_id")->paginate(15);
So that we can continue to be used where () method to add conditions