If I design a database with a securitymaster table that has all the common columns and then have a final column called securitytype which acts as a reference to the sub table, how is it possible to return the extended row (that joins the securitymaster with the sub table in a UDF or Stored Proc)?
In my example, I will abbreviate the securitymaster table as A, the subtables are B,C,...,Z. Each subtables has its own specific columns. Let's further imagine the A has the first column a1 which is the PK and the last column a10 that holds the value B,...,Z (I.e. a FK to the subtable name). The number of columns in the sub table differ and will normally be specific to each table, however some tables may share the same column names.
If I have a securityID, say @sID, then, I will need to join the table as defined in A.a10 where A.a1 = @sID. I will then need to present select * from F (let's imagine A.a10 was equal to F). I have tried with Execute, but people say its a bad method, also I don't know how to return the value or the combined row from an EXEC within a sp. UDF looks impossible as they can not be dynamic. An example would be really useful as I feel this should be a fundamental tenant of any DB?