[英]Query in a query? (MS Access)
我有一个任务表,例如:
TaskTitle DueDate Person Manager
Report 3/28/15 John Dave
Inspection 4/10/15 Brian Shane
和联系人表:
ID Contact Email Manager
1 John john@company.com False
2 Dave dave@company.com True
3 Brian brian@company.com False
4 Shane shane@company.com True
我想做的是编写一个查询,像这样:
PEmail MEmail TaskTitle
john@company.com Dave@company.com Report
brian@company.com Shane@company.com Inspection
我可以查询选择PEmail或MEmail,但不能同时选择两者?
SELECT [Contacts].[Email], [Tasks].[TaskTitle]
FROM tasks
LEFT JOIN [Contacts]
ON [Tasks].[Person] = [Contacts].[Contact]
和
SELECT [Contacts].[Email], [Tasks].[TaskTitle]
FROM tasks
LEFT JOIN [Contacts]
ON [tasks].[Manager] = [Contacts].[Contact]
这有什么特别的东西吗? 多重联接还是多重选择? 我真的一直坚持下去。
SELECT [ManagerContacts].[Email] MEmail,
[PersonContacts].[Email] PEmail,
[Tasks].[TaskTitle]
FROM tasks
LEFT JOIN [Contacts] ManagerContacts
ON [tasks].[Manager] = [ManagerContacts].[Contact]
LEFT JOIN [Contacts] PersonContacts
ON [tasks].[Person] = [PersonContacts].[Contact]
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