Laravel SQL 查询采购到期清单

Question

我有两个 table purchases 和 purchase_transactions

purchases table

id	purchase_id	bill
1	001	10
2	002	20

purchase_transactions table

id	purchases_id	paid_amount	due_amount
1	001	5	5
2	002	10	10
3	002	5	5

我要查询采购到期清单

为此，我在 Laravel Controller

中进行了如下查询

DB::table("purchase_transactions")
    ->join("purchases", "purchases.purchases_id", "=", "purchase_transactions.purchases_id")
    ->select(
        "purchase_transactions.purchases_id",
        "purchases.total_amount as total_amount",
        "purchases.net_payable_amount as net_payable_amount",

        DB::raw("(SELECT SUM(purchase_transactions.paid_amount) FROM purchase_transactions
        WHERE purchase_transactions.purchases_id = purchases.purchases_id)"),

        "purchase_transactions.due_amount as due_amount",
    )
    ->where("purchase_transactions.id","=", $purchase_due_id[$i]->id)
    ->get();

但无法获得准确的格式化结果。这是查询结果

[
    [
        [
            {
                "purchases_id": "202203-011",
                "total_amount": 10,
                "net_payable_amount": 10,
                "(SELECT SUM(purchase_transactions.paid_amount) FROM purchase_transactions\n WHERE purchase_transactions.purchases_id = purchases.purchases_id)": 5,
                "due_amount": 5
            }
        ]
    ],
    [
        [
            {
                "purchases_id": "202203-010",
                "total_amount": 20,
                "net_payable_amount": 20,
                "(SELECT SUM(purchase_transactions.paid_amount) FROM purchase_transactions\n                                        WHERE purchase_transactions.purchases_id = purchases.purchases_id)": 15,
                "due_amount": 5
            }
        ]
    ]
]

问题出在哪里？有人帮忙吗？

Answer 1

您可以为表达式添加别名：

DB::raw("(SELECT SUM(purchase_transactions.paid_amount) FROM purchase_transactions WHERE purchase_transactions.purchases_id = purchases.purchases_id) as sum"),