Lookup using textbox value as source showing too many rows + SSRS - reporting-services

Question

I did a lookup function in ssrs where the source is a reportItem reference. I want to return the value from the table that I am looking up based on the reportItem reference. The report is retrieving the correct values, but and I'm getting repeated rows and I'd like to know if there's a way to eliminate that. My parameters in the tablix is based on a ticket number.
The underlying data has 3 transactions but 9 rows are currently being returned.
In SSRS, my query is:
Select
ticketno, name, control, value
from ticket a
inner join details b on a.ticketno = b.ticketno
where control like 'LS%' and ticket = 'ED08'
The return result contains 4 rows transactions
ie:
Ticket
Name
Control
Value
ED08
Eng
LS1
A
ED08
Acct
LS2
B
ED08
Med
LS3
C
In SSRS, I used a table and hard coded the Name as it's possible that there will be no values.
I hard coded Eng, Acct, Med, Dent for names.
I entered an expression on each individual row with an expression
=lookup(ReportItems!textbox.Value,Fields!Name.Value,Fields!Value.Value, "UDF_Det")
However, when I run the report, I get extra rows.
The transactions retrieved from the ticket in SQL only retrieved 3 rows, so I would have expected that. Is there a way to filter on row specific data?
I have looked at this post Adding values to a Report when there is no Data in query SSRS but since I am not doing any calculations I'm not sure why I am getting repeat rows.
My design looks like this:
Output looks like this:

Answer 1

Acually, now I've edited your question I understand the problem. :)
You can just get a list of Name and left join from it to your existing query.
You maybe able to get the list from an existing table (hopefully) or you could hardcode one (avoid if possible).
Assuming all the Names you need are in your ticket table you could use something like this...
SELECT DISTINCT [Name] FROM ticket
(if name comes from another table, just change the query to suit)
then left join your existing query to this, something like
SELECT n.[Name], t.ticketno, t.control, t.value
FROM (SELECT DISTINCT [Name] FROM ticket) n
LEFT JOIN (
Select ticketno, name, control, value
from ticket a
inner join details b on a.ticketno = b.ticketno
where control like 'LS%' and ticket = 'ED08'
) t
ON n.[Name] = t.[Name]
which should give you something like
Name
Ticket
Control
Value
Eng
ED08
LS1
A
Acct
ED08
LS2
B
Med
ED08
LS3
C
Dent
NULL
NULL
NULL
Then you can simply have one row in the detail group in your table to output the results.
If this does not help, post some sample data from your database tables and show the full report design including row groups etc