如何查找不存在另一个相关行的行

Question

我有一个 table，其中包含发票编号和交易代码。单张发票可以包含交易代码 10 和 11:

+------------------+-----------------+
| Transaction Code |  Invoice Number |
+------------------+-----------------+
|     10           |   CAN000700798  |
|     20           |   CAN000700798  |
+------------------+-----------------+

发票可能只包含交易代码为 10 的记录：

+------------------+-----------------+
| Transaction Code |  Invoice Number |
+------------------+-----------------+
|     10           |   CAN000700798  |
+------------------+-----------------+

显示两种情况的发票示例 table：

+------------------+-----------------+
| Transaction Code |  Invoice Number |
+------------------+-----------------+
|     10           |   CAN000700798  |
+------------------+-----------------+ 
|     10           |   CAN000900999  |
|     20           |   CAN000900999  |
+------------------+-----------------+ 
|     10           |   CAN000700777  |
|     20           |   CAN000700777  |
+------------------+-----------------+

这是我对发票查询的期望 table；因为发票 CAN000700798 只包含交易代码 10 而不是 10 和 20。

+------------------+-----------------+
| Transaction Code |  Invoice Number |
+------------------+-----------------+
|     10           |   CAN000700798  |
+------------------+-----------------+

我需要编写一个查询来查看发票并检查它是否同时包含交易代码为 10 和 11 的记录。如果发票仅包含交易代码 10，return 记录。

Answer 1

如果以下查询适合您，请您试试：

SELECT T.TransactionCode, T.InvoiceNumber
FROM InvoiceTable AS T
WHERE T.TransactionCode = 10 AND NOT EXISTS (
    SELECT 1
    FROM InvoiceTable AS X
    WHERE X.InvoiceNumber = T.InvoiceNumber AND X.TransactionCode <> 10
)

Answer 2

您可以使用 GROUP BY 和 HAVING 子句：

SELECT InvoiceNumber, MIN(TransactionCode) AS TransactionCode
FROM t
GROUP BY InvoiceNumber
HAVING MIN(TransactionCode) = 10
AND    MAX(TransactionCode) = 10

如何查找不存在另一个相关行的行

How to find rows for which another related row does not exist

sql

exists