如何使用 Laravel Query Builder 获取两个不同列的总和？

Question

I'm trying to get the sum of two different columns using Laravel query builder, the plain SQL Query below works just fine, but I can't get it to work with the Laravel Query.

SELECT SUM(logins_sun + logins_mon) FROM users_stats WHERE id = 7; // returns: 1034

Here's what I have tried.

$stats = DB::table('users_stats')->where('id', '=', '7')->sum('logins_sun', '+', 'logins_mon'); // returns: 587.0

And here is my DB structure.

+----+------------+------------+
| id | logins_sun | logins_mon |
+----+------------+------------+
|  7 |     587    |     447    |
+----+------------+------------+

It was supposed to return 1034 but the Laravel Query is returning only the last value 587.0 .

How can I get it working?

Answer 1

sum is an aggregate function and only takes one argument. It will sum the values of each row in a column. In your case, the query only returns one row, so the sum is just the value of that one column (the first argument passed to sum() ). There may be some better way to do it, but I think you should be able to use a raw expression to return the sum of the two columns.

$stats = DB::table('users_stats')
             ->select(DB::raw('logins_sun + logins_mon'))
             ->where('id', '=', '7');

Answer 2

You can try with the sum() method like:

DB::table('users_stats')
    ->where('id', '7')
    ->sum(\DB::raw('logins_sun + logins_mon'));

Answer 3

Try passing a callback to the sum() and do the addition there like:

$stats = DB::table('users_stats')->where('id', '=', '7')->sum(function ($row) {
    return $row->logins_sun + $row->logins_mon;
});

Answer 4

You can run direct raw sql in laravel with the following way :

$sql = "SELECT SUM(logins_sun + logins_mon) FROM users_stats WHERE id = :ID";

$result = DB::select($sql,['ID'=>7]);