Conditional Inner Join

Question

I want to be able to inner join two tables based on the result of an expression.

What I\'ve been trying so far:

INNER JOIN CASE WHEN Reg         


        

Answer 1

Try putting both tables in the query using LEFT JOIN's

LEFT JOIN TimeRegistration TR ON r.rid = TR.Id AND RegT.type =1 
LEFT JOIN DrivingRegistration DR ON r.rid = DR.Id AND RegT.type <>1 

Now, in you select clause, use

CASE RegType.Type WHEN 1 THEN TR.SomeField ELSE DR.someField END as SomeField

The other option is to use dynamic SQL