Laravel 查询构建器，在日期时间进行连接和排序

Question

I have 3 tables: users, user_detailes, activity.

Table: user

id          | username  | password  | firstname | lastname
1           | peter98   | ########  | Peter     | Parker
2           | john001   | ########  | John      | Doe
3           | kelly     | ########  | Kelly     | Johnson  

Table: user_detailes

user_id     | age       | height    | hair_color
1           | 19        | 183       | Black
2           | 23        | 193       | Black
3           | 22        | 165       | Brown

Table: activity

user_id     | action    | description | timestamp
1           | SIGN_IN   | ########    | 2017-10-1 12:00:00
2           | SIGN_OUT  | ########    | 2017-10-1 10:00:00
1           | SIGN_OUT  | ########    | 2017-10-1 13:00:00
2           | SIGN_IN   | ########    | 2017-10-1 13:10:00
2           | SIGN_OUT  | ########    | 2017-10-1 13:30:00

I need a select statement with Laravel Query Builder or a SQL raw statement to get a user and his/her user_detailes and the last activity they did.

For example:

id          | firstname | lastname    | age     | hair_color    | last_action   | last_action_timestamp
1           | Peter     | Parker      | 19      | Black         | SIGN_OUT      | 2017-10-1 13:00:00
2           | John      | Doe         | 23      | Black         | SIGN_IN       | 2017-10-1 13:10:00
3           | Kelly     | Johnson     | 22      | Brown         | NULL          | NULL

I can't get my head around the join statement with the date sorting ;)

Answer 1

I believe it is this as SQL query

SELECT u.id, u.firstname, u.lastname, ud.age, ud.hair_color, a.action, a.timestamp
FROM user u
INNER JOIN user_detailes ud ON u.id = ud.user_id
INNER JOIN activity a ON u.id = a.user_id
ORDER BY a.timestamp DESC

For a per User query I recommend using Eloquent instead

Answer 2

First of all, as I can see you have one to one relationship between your user table and user_detailes table, and one to many relationships between user table and activity. that means if you join all of these tables you will have as result multi-row of one user with his user_detailes and activity because you have one to many relationships between user and activity tables. if you want to get all data like this, the query builder bellow can help you:

$users = DB::table('users')
        ->join('user_detailes', 'users.id', '=', 'user_detailes.user_id')
        ->join('activity', 'users.id', '=', 'activity.user_id')
        ->select('users.*', 'contacts.*', 'orders.*')
        ->orderBy('activity.timestamp', 'desc')
        ->get();

and if you want to get user_detailes and activity data of one user by his id, just you need to add where a statement like this :

$users = DB::table('users')
        ->join('user_detailes', 'users.id', '=', 'user_detailes.user_id')
        ->join('activity', 'users.id', '=', 'activity.user_id')
        ->select('users.*', 'contacts.*', 'orders.*')
        ->where('users.id','=',$user_id)
        ->orderBy('activity.timestamp','desc')
        ->get();

I wish this can help you