mysql - 对 2 个表的 Eloquent 查询

Question

我收到以下错误:

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'value' in 'where clause' (SQL: select sum(gross) as value, first_name from clients left join transactions on clients.id = transactions.client_id where value > 0 group by first_name)

从这个函数？

$data = DB::table('clients')->leftjoin('transactions','clients.id','=','transactions.client_id')
        ->select(DB::raw('sum(gross) as value, first_name'))
        ->where('value','>',0)
        ->groupBy('first_name')
        ->get();

return $data;

Answer 1

SQL is evaluated backwards, from right to left. So the where clause is parsed and evaluate prior to the select clause. Because of this the aliasing of sum(gross) to value has not yet occurred.

Aliases can be used in GROUP BY, ORDER BY, or HAVING clauses.

因此，请在下面的地方使用 sum(gross)，而不是在其中使用 value。

$data = DB::table('clients')->leftjoin('transactions','clients.id','=','transactions.client_id')
        ->select(DB::raw('sum(gross) as value, first_name'))
        ->where('sum(gross)','>',0)
        ->groupBy('first_name')
        ->get();

return $data;