Calculate the row value based on different formula - sql-server

Question

I want to calculate the cell values based on the given formula in each row.
Input record is:
Expected ouput is:

Answer 1

First thing is your formula is not correct. As I understand there is unique row for each sl. And to do the sum of col1 and col2 correct formula is (col1 + col2). So correct that thing first.
After that you may implement this using dynamic sql as
create table tab_sum ( id int, col1 int, col2 int, col varchar(max) )
insert into tab_sum ( id, col1, col2, col )
values ( 1, 3, 5, '(col1 + col2)' )
, ( 2, 4, 6, '(col1 + col2)' )
DECLARE #query NVARCHAR(MAX) = '';
WITH CTE_DistinctFormulas AS
(
SELECT DISTINCT col as Formula FROM tab_sum
)
SELECT #query = #query + '
UNION ALL
SELECT id, col1, col2, col, ' + Formula + ' AS CalcValue FROM tab_sum WHERE col = ''' + Formula + ''' '
FROM CTE_DistinctFormulas;
SET #query = STUFF(#query,1,12,'');
PRINT #query;
EXEC (#query);
Or if editing formula is not an option for you then you may try this, But make sure you have only one row for each id and its corresponding values otherwise it will sum all of the similar rows in one.
create table tab_sum ( id int, col1 int, col2 int, col varchar(max) )
insert into tab_sum ( id, col1, col2, col )
values ( 1, 3, 5, 'sum(col1 + col2)' )
, ( 2, 4, 6, 'sum(col1 + col2)' )
DECLARE #query NVARCHAR(MAX) = '';
WITH CTE_DistinctFormulas AS
(
SELECT DISTINCT col as Formula FROM tab_sum
)
SELECT #query = #query + '
UNION ALL
SELECT id, col1, col2, col, ' + Formula + ' AS CalcValue FROM tab_sum WHERE col = ''' + Formula + ''' group by id, col1, col2, col '
FROM CTE_DistinctFormulas;
SET #query = STUFF(#query,1,12,'');
PRINT #query;
EXEC (#query);

Answer 2

I think you want something like this:
select *,case when row_cal like '%1%' and row_cal like '%2%' then value1 + value2
when row_cal like '%1%' and row_cal like '%3%' then value1 + value3
end as result from YourTable

Answer 3

Did you have a look at the case/ when expression? See MS doc: CASE
So your query would be somthing like:
SELECT sl, audience_1, audience_2, audience_3,
CASE WHEN audience_3 > 0 THEN audience_1 + audience_3
ELSE audience_1 + audience_2
END audience_total
FROM audience
;
You did not provide the criteria, so I had to guess :-)
(I did not run the query since I had no server handy :-) )
UPDATE after comment by OP:
If you have 71 different columns for audience in the same table you have a differnt issue imho.
Then my solution would be:
split out the audience number to a detail table with sl,
audience_type and audience_count
create a audience_calc_config table with two columns calc_method and audience_type
for each different calculation and audience type add an entry to the above
table
remove formula from original table and replace with appropriate
calc_method
Then run a simple select with a JOIN, GROUP BY sl and SUM(audience)
(Of course it would be even nicer to split the audience_calc to a
master/ detail, so you can have a foreign key...)