Schema::create('products', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->float('trade_price', 8, 2);
            $table->float('sell_price', 8, 2);
            $table->integer('quantity');
            $table->integer('shop_id')->unsigned();
            $table->foreign('shop_id')->references('id')->on('shops');
            $table->integer('category_id')->unsigned();
            $table->foreign('category_id')->references('id')->on('categories');
            $table->timestamps();
        });

Schema::create('shops', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
	        $table->string('address');
            $table->timestamps();
        });