Question

我正在尝试通过其SSN提取一组员工的所有帐户。同时还通过其FA编号提取所有帐户（包括他们管理的帐户以及属于自己的帐户）。

这是我到目前为止的代码。 SSN联接正在工作，但是我在最后一次联接时遇到了麻烦，将emp_id连接到FA_emp_id

SELECT [Employee List].ID, 
[Employee List].FirstName, 
[Employee List].LastName, 
dbo_person.prsn_ssn_id, 
dbo_person.prsn_emp_id, 
Left([dbo_account_holder]![account_id],8) AS Account, 
dbo_account_holder.holder_nickname, 
dbo_account_holder.holder_reference_name
FROM ((([Employee List] LEFT JOIN dbo_person ON [Employee List].emp_id = dbo_person.prsn_emp_id) 
LEFT JOIN dbo_account_holder ON dbo_person.prsn_ssn_id = dbo_account_holder.holder_ssn_id) 
LEFT JOIN dbo_account ON dbo_account_holder.account_id = dbo_account.account_id)
LEFT JOIN  dbo_account ON [Employee List].emp_id = dbo_account.fa_emp_id
WHERE (((dbo_account.date_account_closed) Is Null));

Answer 1

尝试避免不愉快的（）

，并且不要在其中有条件的情况下使用左联接表的列。如果执行此操作，那么此条件将作为内部联接工作将条件添加到相关的on子句

SELECT [Employee List].ID, 
[Employee List].FirstName, 
[Employee List].LastName, 
dbo_person.prsn_ssn_id, 
dbo_person.prsn_emp_id, 
Left([dbo_account_holder]![account_id],8) AS Account, 
dbo_account_holder.holder_nickname, 
dbo_account_holder.holder_reference_name
FROM [Employee List] 
LEFT JOIN dbo_person ON [Employee List].emp_id = dbo_person.prsn_emp_id
LEFT JOIN dbo_account_holder ON dbo_person.prsn_ssn_id = dbo_account_holder.holder_ssn_id
LEFT JOIN dbo_account ON dbo_account_holder.account_id = dbo_account.account_id
LEFT JOIN  dbo_account ON [Employee List].emp_id = dbo_account.fa_emp_id 
                    AND  dbo_account.date_account_closed Is Null;

如何联接表并提取结果以进行附加联接

1 个答案: