相同的表SQL联接

我有两个select语句，我的目的是显示账单金额和罚款金额。可以使用连接来完成吗

SELECT SUM([Amount]) AS 'BILLING',(SELECT SUM([Amount])
                                FROM Transactions
                                WHERE CAST([TransactionDate] AS DATE)>(SELECT TOP 1 CAST([TransactionDate] AS DATE)  
                                FROM Transactions WHERE CustNo = 6313 AND [Particulars]='Payment' ORDER BY [Id] DESC) 
                                AND [CustNo]=6313 
                                AND [Particulars]='Penalty') AS 'PENALTY'
FROM Transactions
WHERE CAST([TransactionDate] AS DATE)>(SELECT TOP 1 CAST([TransactionDate] AS DATE)  
FROM Transactions WHERE CustNo = 6313 
AND [Particulars]='Payment' ORDER BY [Id] DESC) 
AND [CustNo]=6313 
AND [Particulars]='Billing'

---

您可以使用条件聚合：

SELECT SUM(CASE WHEN [Particulars]='Billing' THEN [Amount] ELSE 0 END) AS 'BILLING',
       SUM(CASE WHEN [Particulars]='Penalty' THEN [Amount] ELSE 0 END) AS 'PENALTY',
FROM Transactions
WHERE CAST([TransactionDate] AS DATE)>(SELECT TOP 1 CAST([TransactionDate] AS DATE)  
FROM Transactions WHERE CustNo = 6313 
AND [Particulars]='Payment' ORDER BY [Id] DESC) 
AND [CustNo]=6313 
AND [Particulars]='Billing'

是的，它可以。那么，你满意吗？您的实际1具体非重复问题是什么？请在代码问题中给出一个--cut&paste&runnable代码；示例输入（作为初始化代码）以及所需和实际输出（包括逐字错误消息）；标签和版本；清晰的说明和解释。对于包含最少代码的错误，您可以给出“显示为OK”的代码，并通过“显示为not OK”的代码进行扩展。（调试基础。）用于包含DBMS和DDL的SQL，其中包括约束、索引和表格初始化。