<ul><li>Using SELECT * may seem convenient, but it’s a bad habit for multiple reasons.</li><li>Indexes can significantly speed up data retrieval. However, failing to use indexes properly leads to slower queries.</li><li>Subqueries are often used when developers are unaware of efficient joins. Subqueries can be slower and harder to read compared to proper JOIN operations.</li><li>Failing to sanitize user inputs opens the door for SQL injection attacks, which can compromise your database.</li></ul>

Common SQL Mistakes Developers Make

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