Select Distinct rows from 3 tables

Question

I need to retrive information from 3 different tables by applying a specific condition.
I have the following query which works fine for retrieving desired data from 2 tables.
SELECT
a.userId
FROM userGeneral
a inner
join userSpecific
b on a.userId
= b.userId
WHERE
a.userActive
= 1
userId
111
222
333
444
Now I have a third table called userMgr which may contain multiple records for each userId with a corresponding mgrId value. It has a primary key identity column called userRecId and I would like to fetch the
mgrId value corresponding to the MAX(userRecId) for the matching userId.
userRecId  |  userId  | mgrId
1 |    111    | 123
2 | 111 | 234
3 | 111 | 345
4 | 333 | 345
5 | 333 |  456
The resultset should be as follows after joining all the 3 tables.
userId | mgrId
111 | 345
222 | NULL
333 | 456
444 | NULL
Can anyone please help with this query.

Answer 1

I need to retrive information from 3 different tables by applying a specific condition.
I have the following query which works fine for retrieving desired data from 2 tables.
SELECT
a.userId
FROM userGeneral
a inner
join userSpecific
b on a.userId
= b.userId
WHERE
a.userActive
= 1
userId
111
222
333
444
Now I have a third table called userMgr which may contain multiple records for each userId with a corresponding mgrId value. It has a primary key identity column called userRecId and I would like to fetch the
mgrId value corresponding to the MAX(userRecId) for the matching userId.
userRecId  |  userId  | mgrId
1 |    111    | 123
2 | 111 | 234
3 | 111 | 345
4 | 333 | 345
5 | 333 |  456
The resultset should be as follows after joining all the 3 tables.
userId | mgrId
111 | 345
222 | NULL
333 | 456
444 | NULL
Can anyone please help with this query.
try this:
select userId,userRecId,
from userMgr,
(SELECT a.userId, max(a.userRecId)
FROM userGeneral a inner join userSpecific b on a.userId = b.userId
group by a.userId
WHERE a.userActive = 1) table1(userId,userRecId)
where userMgr.userRecId = table1.userRecId