SSRS lookup with source not in current tablix - reporting-services

Question

I have 3 tables that I want to show in a tablix SSRS report in 3.0.
Table 1 - policy ID, amt paid by company
Query - Select * from table1 where amt paid by company <> 0
Table 2 - policy ID, policy number, previous policy number
Query - Select * from table2 where previous policy number <> ' '
Table 3 - previous policy number, paid under prior company
Query - Select * from table3 where paid under prior company <> 0
I want to display the following columns on one tablix row per entry in table 1:
Policy number
amt paid by company
previous policy number
paid under prior company.
I created a tablix. I can display everything from table 1 and use lookup for table 2 items but when I do a lookup for item from table 3 it gives me an error.
From my research about this error I understand it to mean I cannot use the source in lookup from any table but table 1 in my case. And I can only do one level in lookup.
I have looked and can find no example for this anywhere and I have tried other methods and cannot figure out how to get to that piece of data in table 3.
Is my only choice to combine tables 2 and 3 together then use in this report with the lookup?

Answer 1

You can use INNER JOIN to get a dataset that contains all fields you require to show in the tablix.
SELECT
table2.PolicyNumber,
table1.AmntPaidByCompany,
table2.PrevPolicyNumber,
table3.PaidUnderPriorCompany
FROM table2
INNER JOIN table3
ON table2.PrevPolicyNumber = table3.PrevPolicyNumber
INNER JOIN table1
ON table1.PolicyID = table2.PolicyID
WHERE table1.AmntPaidByCompany <> 0
AND table2.PrevPolicyNumber <> ''
AND table3.PaidUnderPriorCompany <> 0
Live Demo
Let me know if this helps.