A common SQL habit is to use SELECT * on a query, because it’s tedious to list all the columns you need. Plus, sometimes those columns may change over time, so why not just do things the easy way? But ...

SQL is a convenient way to manage and query your data, but badly written queries can tie up your database. Here are seven common SQL traps and how to avoid them. Database developers have it tough.

Two eBook offers (worth a combined $28) that you can download for free expire today, here's a reminder of the SQL Essentials For Dummies offer. FOR DUMMIES is a ...