从 laravel 的内部连接表中选择特定列

Question

我需要 invoice,invoice_details 表中的所有列，但我只想从付款表中获取一列（列名：amount）。我的查询是什么？这是我的控制器。

$all_invoice = DB::table('invoice')
        ->join('invoice_details', 'invoice.invoice_id', '=', 'invoice_details.invoice_id')
        ->join('payment', 'invoice.invoice_id', '=', 'payment.invoice_id')
        ->where('invoice.client_id', 7)
        ->orderBy('invoice.invoice_id', 'DESC')
        ->get();

Answer 1

这很简单，你需要像这样在查询中添加选择子句。

$all_invoice = DB::table('invoice')->select(['invoice.*', 'payment.amount']) ->join('invoice_details','invoice.invoice_id','=','invoice_details.invoice_id') ->join('payment','invoice.invoice_id','=','payment.invoice_id')->where('invoice.client_id',7)->orderBy('invoice.invoice_id','DESC') ->get();

如果仍有查询，请参阅查询中的选择选项中的 laravel 文档。

Answer 2

只使用选择

$all_invoice = DB::table('invoice')
       ->join('invoice_details', 'invoice.invoice_id','=','invoice_details.invoice_id')
       ->join('payment', 'invoice.invoice_id', '=', 'payment.invoice_id')
       ->where('invoice.client_id', 7)
       ->select('payment.amount')
       ->orderBy('invoice.invoice_id', 'DESC')
       ->get();