Unlearning What No Longer Works: The Hardest Part of Growth
For six months, I wrote every SQL query like this: SELECT * FROM users WHERE id = 123; SELECT star. Get all the columns. Always. My reasoning: “I might need all the data. Better to have it than query again.” This worked fine for my bootcamp projects. Tables had 5 columns. Performance didn’t matter. Then I joined a company with real production data. My first code review: Senior Engineer: “Why are you selecting all columns?” ...