如何基于相同的列值合并表行数据

Question

I have table name abc and it's columns are

id    table_row_name   a     b    c
1     user             1     1    Null
2     user             Null  Null 1  

How can I merge into one record with query like below and what will be the laravel way of doing it

      table_row_name   a     b    c
      user             1     1    1

Answer 1

You can try below query

select table_row_name, max(a) as a, max(b) as b, max(c) as c
from tablename
group by table_row_name

Answer 2

You can simply achieve that by this query:

\DB::table('abc')
        ->select([
            'table_row_name',
            \DB::raw('MAX(a) as a'),
            \DB::raw('MAX(b) as b'),
            \DB::raw('MAX(c) as c')
        ])
        ->groupBy('table_row_name')
        ->get();