The multi-part identifier could not be bound - SQL Server 2014 - sql

Question

I am trying to solve the error in the below query
Yes I have checked many same questions but still can not figure out the solution
The error:
The multi-part identifier "Table_2.id" could not be bound.
When I remove the inner join the query runs perfectly fine
I have to solve this problem without turning it into explicit joins because i have so many dynamic filtering which add and x=y clauses to the end of the query
Thank you
SELECT TOP 10 username,
NAME,
table_1.authoritylevel,
totalcount,
avglevel,
table_2.pokemonid,
pokemonlevel,
table_2.id,
pokemonexp,
battlecount,
battlevictorycount,
table_1.userid
FROM table_1,
table_2,
table_3,
table_4
LEFT OUTER JOIN (SELECT Count(table_5.offereruserid) AS OfferCount,
table_5.offereduserspokemonsid
FROM table_5
GROUP BY offereduserspokemonsid) innerQuestion
ON innerQuestion.offereduserspokemonsid = table_2.id
WHERE table_3.pokemonid = table_2.pokemonid
AND pokemonplace = 'trade'
AND table_4.pokemonid = table_2.pokemonid
AND table_2.userid = table_1.userid
AND table_2.userid != 1

Answer 1

If you are keen on keeping the implicit joins, you could split your query into several result sets using WITH. According to this article, you can no longer do "implicit outer joins." Give this a try:
WITH OfferCounts as
(
SELECT Count(table_5.offereruserid) AS OfferCount, table_5.offereduserspokemonsid
FROM table_5
GROUP BY offereduserspokemonsid
),
EverythingElse AS
(
SELECT TOP 10 username,
NAME,
table_1.authoritylevel,
totalcount,
avglevel,
table_2.pokemonid,
pokemonlevel,
table_2.id,
pokemonexp,
battlecount,
battlevictorycount,
table_1.userid
FROM table_1,
table_2,
table_3,
table_4,
WHERE table_3.pokemonid = table_2.pokemonid
AND pokemonplace = 'trade'
AND table_4.pokemonid = table_2.pokemonid
AND table_2.userid = table_1.userid
AND table_2.userid != 1
)
Select *
From EverythingElse t1
left join OfferCounts t2 on t1.offereduserspokemonsid = t2.id

Answer 2

The specific problem comes from the use of implicit joins first and then an explicit join. Lesser lines of code is not a very good reason to use implicit joins, specially since it's deprecated.
Another considerations would be to use table aliases, and also to prefix every column with the corresponding table alias, even if the column is unique between those tables for readability and a code that's easier to maintain.
You are also missing the GROUP BY needed for your aggregation function. All in all, the fixed code would be:
SELECT TOP 10 username,
NAME,
T1.authoritylevel,
totalcount,
avglevel,
T2.id,
T2.pokemonid,
pokemonlevel,
pokemonexp,
battlecount,
battlevictorycount,
T1.userid,
Count(T5.offereruserid) AS OfferCount
FROM Table_1 T1
INNER JOIN Table_2 T2
ON T1.userid = T2.userid
INNER JOIN Table_3 T3
ON T2.pokemonid = T3.pokemonid
INNER JOIN Table_4 T4
ON T2.pokemonid = T4.pokemonid
INNER JOIN Table_5 T5
ON T5.offereduserspokemonsid = T2.id
WHERE pokemonplace = 'trade'
AND T2.userid != 1
GROUP BY username,
NAME,
T1.authoritylevel,
totalcount,
avglevel,
T2.id,
T2.pokemonid,
pokemonlevel,
pokemonexp,
battlecount,
battlevictorycount,
T1.userid;
But, as I said, I suggest that you add the corresponding prefixes to those columns.