MSSQL Inner Join on Concatenated Column - sql

Question

I'm not a DBA so please don't yell at me. Trying to do an inner join and Group By using a concatenated column. The ON statement is producing a syntax error. I do not have access to the original tables and am trying to normalize this into another table, I know its ugly. Not overly worried about performance, just need to work. Cant use functions either.
SELECT DISTINCT A.[carrier_code],[carrier_name], [carrier_grouping], A.[collector_name], [dataset_loaded], [docnum], [envoy_payer_id], [loc], [market], [master_payor_grouping], [plan_class], [plan_name], A.[resp_ins],A.[resp_ind], A.[resp_payor_grouping], A.[Resp_Plan_Type], A.[rspphone], A.[state], A.[sys],A.[resp_ins]+A.[resp_payor_grouping]+A.[carrier_code]+A.[state]+A.[Collector_Name] as ExtId
FROM [Table1] A
INNER JOIN
(SELECT [resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name] as Extid
FROM [Table1]
WHERE [resp_ind] = 'Insurance'
GROUP BY [resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name]) B
ON A.[resp_ins]+A.[resp_payor_grouping]+A.[carrier_code]+A.[state]+A.[Collector_Name] = B.[resp_ins]+B.[resp_payor_grouping]+B.[carrier_code]+B.[state]+B.[Collector_Name];
My ON and Group By statements are eventually the primary key in new table.

Answer 1

Your alias B hasn't columns as you mentioned. It has just on column Extid.
SELECT DISTINCT A.[carrier_code],[carrier_name], [carrier_grouping], A.[collector_name], [dataset_loaded], [docnum], [envoy_payer_id], [loc], [market], [master_payor_grouping], [plan_class], [plan_name], A.[resp_ins],A.[resp_ind], A.[resp_payor_grouping], A.[Resp_Plan_Type], A.[rspphone], A.[state], A.[sys],A.[resp_ins]+A.[resp_payor_grouping]+A.[carrier_code]+A.[state]+A.[Collector_Name] as ExtId
FROM [Table1] A
INNER JOIN
(SELECT [resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name] as Extid
FROM [Table1]
WHERE [resp_ind] = 'Insurance'
GROUP BY [resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name]) B
ON A.[resp_ins]+A.[resp_payor_grouping]+A.[carrier_code]+A.[state]+A.[Collector_Name] = B.Extid;

Answer 2

Try this, I didn't put all the column in result, you can manage yourself.
select A.*
from
(
select [carrier_code],[carrier_name], [sys],[resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name] as ExtId
FROM [Table1]
) A
inner join
(
select distinct Extid
from
(
SELECT [resp_ins]+[resp_payor_grouping]+[carrier_code]+[state]+[Collector_Name] as ExtId
FROM [Table1]
WHERE [resp_ind] = 'Insurance'
) ins
) B on (A.ExtId = B.ExtId)

Answer 3

You don't need to concatenate the values - you can GROUP BY and JOIN on multiple columns.
SELECT DISTINCT
...
FROM
[Table1] A
INNER JOIN
(
SELECT
[resp_ins],
[resp_payor_grouping],
[carrier_code],
[state],
[Collector_Name]
FROM
[Table1]
WHERE
[resp_ind] = 'Insurance'
GROUP BY
[resp_ins],
[resp_payor_grouping],
[carrier_code],
[state],
[Collector_Name]
) B
ON
(
A.[resp_ins] = B.[resp_ins]
Or
(A.[resp_ins] Is Null And B.[resp_ins] Is Null)
)
And
(
A.[resp_payor_grouping] = B.[resp_payor_grouping]
Or
(A.[resp_payor_grouping] Is Null And B.[resp_payor_grouping] Is Null)
)
And
(
A.[carrier_code] = B.[carrier_code]
Or
(A.[carrier_code] Is Null And B.[carrier_code] Is Null)
)
And
(
A.[state] = B.[state]
Or
(A.[state] Is Null And B.[state] Is Null)
)
And
(
A.[Collector_Name] = B.[Collector_Name]
Or
(A.[Collector_Name] Is Null And B.[Collector_Name] Is Null)
)
;