简单查询导致多行结果

Question

我正在运行一个简单的查询，如下所示：

SELECT Administrator_TRANSACTIONS.TRANSACTION_TYPE,
       Administrator_TRANSACTIONS.TRANID
FROM Administrator_TRANSACTIONS, Administrator_TRANSACTION_LINES, Administrator_ITEMS
WHERE (((Administrator_TRANSACTIONS.TRANSACTION_TYPE)="Sales Order") AND
       ((Administrator_TRANSACTIONS.TRANID)="379"));

表中只有该条件的记录/行。但是，这导致多行结果与下面相同。你能帮忙解决为什么会这样吗？

Answer 1

您选择的表太多了。只需使用您需要的表格：

SELECT Administrator_TRANSACTIONS.TRANSACTION_TYPE,
       Administrator_TRANSACTIONS.TRANID
FROM Administrator_TRANSACTIONS
WHERE (((Administrator_TRANSACTIONS.TRANSACTION_TYPE)="Sales Order") AND
       ((Administrator_TRANSACTIONS.TRANID)="379"));