SQL JOIN Returning no values - sql

Question

I am working with 3 tables with the following Names and columns:
*Table 1*
**Users**
UserID UserName UserTypeNumber
1 John 1N
2 Mary 1N
3 Doe 1N
4 Sullivan 2N
5 Sally 1N
**Key = UserID**
*Table 2*
**MobileUsers**
Userid MobileAccess
1 Yes
2 Yes
3 Yes
4 Yes
5 No
**Key = UserID**
*Table 3*
**PanCards**
UserID CARD_NUMBER
3 2222
4 3333
5 1111
Key = UserID
Explanation:
Every user is available in both Users and MobileUsers table
However, not all users are present in PanCards table. This is
because only users that have been assigned a Card appears in the
PanCards table. In this case Doe with UserID=3 and Sullivan with UserID=4 have a card, hence they appear in PanCards table
Problem:
What I want to achieve is to filter out the users from
MobileUsers table that have MobileAccess equivalent to Yes and thier UserTypeNumber equivalent to 1N in the Users table but are not present in the PanCards table.
What I have so far is the below SQL Query:
SELECT MobileUsers.Userid, MobileUsers.MobileAccess
FROM MobileUsers
INNER JOIN Users
ON MobileUsers.Userid = Users.UserID
INNER JOIN PanCards
ON Users.UserID = PanCards.UserID
WHERE MobileUsers.MobileAccess = 'Yes'
AND
Users.UserTypeID = '1N'
AND
MobileUsers.Userid NOT IN
(SELECT PanCards.UserID FROM PanCards)
Result is an Empty table
Userid MobileAccess
However what i want is to have the below result returned:
Userid MobileAccess
1 Yes
2 Yes
How do i fix this and get the correct results please ?

Answer 1

If you want to use JOIN, then use a LEFT JOIN for PanCards and check for no matches:
SELECT mu.*
FROM MobileUsers mu JOIN
Users u
ON mu.Userid = u.UserID LEFT JOIN
PanCards pc
ON pc.UserID = mu.UserID
WHERE mu.MobileAccess = 'Yes' AND
u.UserTypeID = '1N' AND
pc.UserID IS NULL;
I think your query would work without the join to PanCards.

Answer 2

WITH NotPan -- First get users that are not in the PanCards table
AS
(
select * from Users as u
where u.userid not in (select userid from PanCards)
)
-- Easy from here
select * from NotPan as n
inner join mobileUsers m on m.userid = n.userid
inner join Users as u on n.userid = u.userid
WHERE m.MobileAccess = 'Yes' and u.UserTypeNumber = '1N'