SQL SELECT 多次返回相同的项目

Question

I have the following SQL Command:

SELECT * 
FROM Notes 
INNER JOIN  AuthorizedPersons 
ON Notes.idPass = AuthorizedPersons.idPass 
AND AuthorizedPersons.Privileged = 0 
AND Notes.idUser =7

This returns the correct items! BUT returns the same item twice for each AuthorizedPerson that exists!

(Using DISTINCT does not solve the problem because items can have the same name.)

Query Results:

As you can see in the idPass 15 and 16 the description can be the same BUT idPass cannot since it's the primary key!

The query returns 3 times the idPass 30...

Answer 1

尝试使用 Where 而不是第一个 AND。

SELECT * FROM Notes INNER JOIN AuthorizedPersons ON Notes.idPass = AuthorizedPersons.idPass WHERE AuthorizedPersons.Privileged = 0 AND Notes.idUser =7

Answer 2

In the table AuthorizedPersons ,column starting with ' IdUs.. ' repeating multiple times against the same idPass .That is why you are getting multiple rows against same value of idpass .For avoiding the duplicate records, you can either use a ' DISTINCT ' keyword after excluding that particular column or you can choose any one of the record from that duplicated record by eliminating the others.