SQL - Finding the links between two tables.

Hello all,

I have two tables in SQL which link together somehow, I am unable to find their path.  Lets call them Cals and Orders.

When an asset comes in it may need a Cal by the Asset Vendor, so we put in an Order to the Vendor, send it out.  The Order table gets an ID, but my god for the life of me I cannot find out how these tables actually link together.

Does anyone have a query/tool I can quickly find these links?  And unfortunately we do not have an SQL Map.

Thanks in advance,

-Samm