Join two tables returning only one row from the second table - sql

Question

I have this query:
SELECT t_ticket.ticketID, t_ticket.addedDate, t_ticket.question,
t_ticket.code, t_ticket.priority, t_actionTicket.addedDateAction, t_actionTicket.title
FROM t_actionTicket INNER JOIN
t_ticket ON t_actionTicket.ticketID_FK = t_ticket.ticketID INNER JOIN
(SELECT ticketID_FK, MAX(addedDateAction) AS maxDate
FROM t_actionTicket AS t_actionTicket_1
WHERE (t_actionTicket.userID_FK <> #userid)
GROUP BY ticketID_FK) AS b ON t_actionTicket.ticketID_FK = b.ticketID_FK AND t_actionTicket.addedDateAction = b.maxDate
WHERE (t_ticket.supporterID_FK IN
(SELECT supporterID
FROM t_Supporter
WHERE (userID_FK = #userid)))
I want to return just the latest record in t_actionTicket table for each row in t_ticket table that t_actionTicket.userID_FK <> #userid.
but I have this error:
The multi-part identifier "t_actionTicket.userID_FK" could not be
bound.

Answer 1

Problem in your query is
FROM t_actionTicket AS t_actionTicket_1
WHERE t_actionTicket.userID_FK <> #userid -- here
You cannot use t_actionTicket alias name inside inner join select query. You need to use t_actionTicket_1. It is possible only in sub-query
Try this better way of doing it
;WITH cte
AS (SELECT t_ticket.ticketID,
t_ticket.addedDate,
t_ticket.question,
t_ticket.code,
t_ticket.priority,
t_actionTicket.addedDateAction,
t_actionTicket.title,
Row_number()
OVER(
partition BY ticketID_FK
ORDER BY addedDateAction DESC) RN
FROM t_actionTicket
INNER JOIN t_ticket
ON t_actionTicket.ticketID_FK = t_ticket.ticketID
WHERE t_ticket.supporterID_FK IN (SELECT supporterID
FROM t_Supporter
WHERE userID_FK = #userid))
SELECT *
FROM cte
WHERE rn = 1

Answer 2

You can write this logic using row_number() instead of additional nested queries:
SELECT t.ticketID, t.addedDate, t.question, t.code, t.priority,
ta.addedDateAction, ta.title AS Expr1
FROM t_Ticket t INNER JOIN
(SELECT ta.*,
ROW_NUMBER() OVER (PARTITION BY ta.ticketID_FK ORDER BY ta.addedDateAction DESC) as seqnum
FROM t_actionTicket ta
) ta
ON t.ticketId = ta.ticketId_FK and ta.seqnum = 1
WHERE t.supporterID_FK IN (SELECT supporterID
FROM t_Supporter
WHERE userID_FK = #userid
);
Note that table aliases make the query easier to write and to read.

Answer 3

Try this query
SELECT t_ticket.ticketID, t_ticket.addedDate, t_ticket.question,
t_ticket.code, t_ticket.priority, t_actionTicket.addedDateAction, t_actionTicket.title
FROM t_actionTicket
INNER JOIN t_ticket ON t_actionTicket.ticketID_FK = t_ticket.ticketID
INNER JOIN (SELECT ticketID_FK, MAX(addedDateAction) AS maxDate
FROM t_actionTicket AS t_actionTicket_1
WHERE (t_actionTicket_1.userID_FK <> #userid)
GROUP BY ticketID_FK) AS b ON t_actionTicket.ticketID_FK = b.ticketID_FK AND t_actionTicket.addedDateAction = b.maxDate
WHERE (t_ticket.supporterID_FK IN
(SELECT supporterID
FROM t_Supporter
WHERE (userID_FK = #userid)))