ok, both CME and CMD are contract, but differ in it's content, one is tower and other is microwave. how to put the class into database ? should i made a contract table , a cme and cmd one... ? any suggestion ?
I'd have two tables because they are separate data relationships. One for towers, one for microwaves.
Why would you need to keep the id's & dates separate to the other information? Wouldn't each entity have a separate id (date's can obviously be the same) ?
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