1. A method of determining a relationship between data in a database, said method comprising: accessing a first data from a first data source, wherein said first data is associated with a first field; accessing a second data from said first data source, wherein said second data is associated with a second field; accessing a third data from a second data source, wherein said third data is associated with a third field; determining whether said second data source comprises said first data; in response to determining that said second data source comprises said first data, determining a relationship between said second field and said third field; and storing said relationship between said second field and said third field.