arvit

Relational DBs work for processing of business transactions -- when you need to get the amount of money and all the other details exactly right, when you need to retrieve the right record according to a variety of criteria which may come from other types of data, and when you need to be sure the info is inserted in exactly the right format.

For this, there are DB transactions, SQL SELECT with joins, and schemas.

Much of this is possible in other technologies, but RDB does it well.

No!

Whatever the reason, do not tell them.

There is no benefit to you. There is unlikely to be benefit to them -- most people can't deal with even polite criticism.

An exception can be when the reason is politically "OK" and obvious, e.g. leaving the job to be a full-time parent.

If you have VERY good relations with your employer, then they will know your feelings in advance anyway.

It's a question of where her/his life is going. You gonna rock with the startups or sleep with the services shops?