A coworker mentioned to me that she came in early every day so she could run a report that took about an hour and a half before the CEO got in. I looked at the

A coworker mentioned to me that she came in early every day so she could run a report that took about an hour and a half before the CEO got in. I looked at the code, nothing looked THAT bad, so I did an EXPLAIN, noticed a missing index, added it. I ran the report in 4 minutes. Clearly, whoever wrote that report didn't know nearly enough about SQL.