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I have a table and I’m trying to split it in a few more tables to get a 3nf, can someone help me? When I validate my tables with Erwin Data Model Validator I get no warnings…but it’s not a 3nf(
http://i43.tinypic.com/35mmuwx.png
and my Erwin scheme:
http://i42.tinypic.com/2hnvx3o.png
Will appreciate any help )
Your mistake is that on Title and on Manager, you should NOT have employee_ID. You shuold have job_Id and mng_id on your Employee table, so the manager and the Title exists only once on your tables and just reference them from your employee table by their Id.
job_start_date and job_end_date should be in your Employee table, unless there is a real reason to use a separate table (like storing multiple start / end dates, but it doesn’t seem the case). The same happens with the salary, although I don’t know about min and max salaries. If that data is inherent to the job title, then those two fields should be in the Title table.