They grow up so fast. Discovered my 8 year old was trying to learn computer programming on Khan Academy, but it was SQL. Pointed her to to save her from the horrors of RDBMS as long as I can.
Conversation
They spend years teaching you to normalize your database only for the real-world to teach you that sometimes partial denormalization is better for your specific application.
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The most important advice I can give from a DBM perspective is this: If you ever have to run a DELETE on a production system, run it as a SELECT first and verify that your statement is 100% correct.