Help in update generic query

Question

HI, Some super_id is wrong or null in my #cred table and I want to update with the correct super_id.
The best way is to COUNT max 'super_id' on the basis of column-'b_id' and 'bid_code'.
Query condition should be based on 'b_id' and 'bid_code'. Please help for the logic of this update query.
I want also add the column of 'Correct super_id is:' in the result with the correct super_id.
Tip. 'b_id' column data must exist in  'bid_code' column. Can we use like command to avoid any hard code in the update and create generic script for update.
Example of new column of 'Correct super_id is:
The record of b_id-'SLEP' and bid_code-'SLEP_LEN' has super_id-'2' three times, one time is '1' and one time is 'null'.
So max super_id is 2 for these and this is correct super_id.
drop table #cred
create table #cred (unique_id numeric,b_id char(10), bid_code char(10), super_id numeric)
insert into #cred values (10012,'SLEP','SLEP_LEN',2)
insert into #cred values (10013,'SLEP','SLEP_LEN',1)
insert into #cred values (10014,'SLEP','SLEP_LEN',2)
insert into #cred values (10015,'SLEP','SLEP_LEN',2)
insert into #cred values (10016,'SLEP','SLEP_LEN',null)
insert into #cred values (10017,'GHEP','GHEP_RET',44)
insert into #cred values (10018,'GHEP','GHEP_RET',44)
insert into #cred values (10019,'GHEP','GHEP_RET',44)
insert into #cred values (10020,'GHEP','GHEP_RET',22)
insert into #cred values (10021,'GHEP','GHEP_RET',null)
insert into #cred values (10022,'SDEP','SDEP_Full',77)
insert into #cred values (10023,'SDEP','SDEP_Full',77)
insert into #cred values (10024,'SDEP','SDEP_Full',55)
insert into #cred values (10025,'SDEP','SDEP_Full',77)
insert into #cred values (10026,'SDEP','SDEP_Full',null)
Select * from #cred order by unique_id
--Desired Results
unique_id    b_id    bid_code    super_id   Correct super_id is:
10012    SLEP          SLEP_LEN      2
10013    SLEP          SLEP_LEN      1             2
10014    SLEP          SLEP_LEN      2
10015    SLEP          SLEP_LEN      2
10016    SLEP          SLEP_LEN      NULL       2
10017    GHEP          GHEP_RET      44       
10018    GHEP          GHEP_RET      44
10019    GHEP          GHEP_RET      44
10020    GHEP          GHEP_RET      22          44
10021    GHEP          GHEP_RET      NULL      44
10022    SDEP          SDEP_Full     77
10023    SDEP          SDEP_Full     77
10024    SDEP          SDEP_Full     55           77
10025    SDEP          SDEP_Full     77
10026    SDEP          SDEP_Full     NULL       77
 

Answer 1

Kevin, try
-- code #1 v2 - list
;with
T as (
SELECT unique_id, b_id, bid_code, super_id,
max(super_id) over(partition by b_id, bid_code) as super_id2
from #cred
where b_id = Left(bid_code, CharIndex('_', bid_code)-1)
SELECT unique_id, b_id, bid_code, super_id,
case when super_id=super_id2 then '' else cast(super_id2 as sql_variant) end as [Correct super_id is:]
from T
order by unique_id;
and
-- code #2 v2 - update
;with
T2 as (
SELECT unique_id,
max(super_id) over(partition by b_id, bid_code) as super_id2
from #cred
where b_id = Left(bid_code, CharIndex('_', bid_code)-1)
UPDATE T1
set T1.super_id= T2.super_id2
output inserted.unique_id, inserted.b_id, inserted.bid_code,
deleted.super_id as [old super_id], inserted.super_id as [new super_id]
from T2 inner join
#cred as T1 on T1.unique_id=T2.unique_id
where (T1.super_id <> T2.super_id2) or T1.super_id is null;
José Diz     Belo Horizonte, MG - Brasil