Question

我有一个表tblConsentQuestion，上面有问题

intID   nvcText      bitActive
17      Question1    True
18      Question2    True
19      Question3    False

和表格tblConsentData，其中包含每个客户的问题

intID   intCustomerID   bitConsent      intIDQuestion 
14      1               False           19
15      1               True            18

WHERE tblConsentQuestion.intID = tblConsentData.intIDQuestion

我想在VB.net数据集中进行检索：

所有tblConsentData都是特定客户的，即两个记录分别为intID = 14和15
bitActive = true tblConsentQuestion中的所有活动（WHERE tblConsentData.intIDQuestion <> tblConsentQuestion.intID）记录，在这种情况下，只有intID = 17条记录（除了两条记录）

输出应为：

Question3   False
Question2   True
Question1   Null

我尝试过类似的事情：

str = "Select tblConsentQuestion.intID, bitConsent, nvcText" & fungGetLangId() & " AS nvcqText " _
    & " From tblConsentData " _
    & " Left OUTER JOIN tblConsentQuestion " _
    & " On tblConsentData.intIDQuestion = tblConsentQuestion.intID " _
    & " where tblConsentData.intCustomerID = " & intCustomerID & " " _
    & " UNION ALL " _
    & " Select tblConsentQuestion.intID, -1, nvcText" & fungGetLangId() & " " _
    & " From tblConsentQuestion " _
    & " Left OUTER JOIN tblConsentData " _
    & " On tblConsentData.intIDQuestion = tblConsentQuestion.intID " _
    & " WHERE(tblConsentQuestion.bitActive = 'True') "

我收到了tblConsentQuestion中的所有活动记录，而我不应该收到intID = 18中存在的tblConsentData的记录。

Answer 1

bitActive的数据类型是什么？它是具有两个可能的字符串的文本字段：'True'和'False'吗？还是“访问是/否”字段？

如果是后者，则您的SQL不应检查字符串值，而应检查True / False常量（假设`fungGetLangId：

WHERE tblConsentQuestion.bitActive = True

或者，更好的是，您可以直接检查是/否字段：

WHERE tblConsentQuestion.bitActive

从两个表中选择不同

1 个答案: