Convert Parameter Query to Take Parameter from Table [closed] - sql

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I been unable to figure out a way to do the query below without using a parameter. The database has over 2000 possible values for the parameter, so what I want is to output a table that lists all the parameters in one column, and the output from the query in the other. Below is a simplified version of what works now:
SELECT [enter name] AS ExclName,
Sum(revenue) AS MaxRev
FROM tbltasks
WHERE tbltasks.task IN (SELECT DISTINCT tblabilities.task
FROM tblabilities
WHERE tblabilities.name <> [enter name]);
tbltasks tblpeople tblabilities
task revenue name name task
A 10 Bob Bob A
B 9 Tom Tom A
C 8 Jack Jack A
D 7 Mary Tom B
E 6 Diane Jack B
F 5 Alice Mary B
G 4 Sam Jack C
H 3 Mary C
I 2 Diane C
Mary D
Diane D
Alice D
Diane E
Alice E
Sam E
Bob F
Tom G
Alice H
Right now I run the query, manually enter a name like "Bob" when prompted, and get a single row of output like:
ExclName MaxRev
Bob 47
But what I want is the complete table:
ExclName MaxRev
Bob 47
Tom 48
Jack 52
Mary 52
Diane 52
Alice 49
Sam 52
Or in other words, I want to know what maximum revenue could be achieved by a team that excluded the named member. The real application is more complicated, as there are other groupings involved (eg. if exclude Jack, must also exclude Mary), but I think if I solve the simple problem above I can handle the rest.
I keep thinking there must be a way to use the names from tblPeople and link them to the MaxRev calculation with a single query, but I haven't been able to figure it out. I could do some code to loop through all the parameters, but am hoping there is a more straightforward solution. Appreciate anyone's input.

Answer 1

you can simply extend your query for all people:
select
p.name as ExclName,
sum(t.revenue) as MaxRev
from tblpeople as p
cross join tbltasks as t
where
t.task in
(
select l.task
from tblabilities as l
where l.name <> p.name
)
group by p.name
sql fiddle demo
update. Still don't know which RDBMS do you using, here's SQL Server solution, it's possible to split solution below into temp table, variable and query to improve performance, but it should be faster than first one anyway (if you have appropriate indexes on your table):
with cte as (
select l.[name], sum(t.[revenue]) as [revenue]
from tblabilities as l
inner join tbltasks as t on t.[task] = l.[task]
where
not exists
(
select *
from tblabilities as tl
where tl.[task] = l.[task] and tl.[name] <> l.[name]
)
group by l.[name]
)
select
p.[name] as ExclName,
t.revenue_total - isnull(c.[revenue], 0) as MaxRev
from tblpeople as p
left outer join cte as c on c.[name] = p.[name]
outer apply (
select sum(tt.[revenue]) as revenue_total
from tbltasks as tt
where
tt.[task] in (select tl.[task] from tblabilities as tl)
) as t
order by p.[name]
sql fiddle demo