JOEL LIPMAN Systems / Automation / AI

Knowledge base / Since 1999

MySQL Tutorials & Guides

Practical MySQL tutorials, troubleshooting notes and implementation guides from real projects.

Advanced search

32 entries / MySQL

Clear filters
Error 1065: Query was Empty
MySQL 25432

Error 1065: Query was Empty

In view of the fact that this error pops up in so many systems I take over, I have often gone down the wrong path following the red herring as it were when in fact the answer to this is very common.

Read note
MySQL: Display Users and Duration in Matrix Timesheet
MySQL 37513

MySQL: Display Users and Duration in Matrix Timesheet

Given Data Activities by employees with start dates and end dates in a mySQL database. Objective User Mon Tue Wed Thu Fri Sat Sun Total --------------- ------- ------- ------- ------- ------- ------- ------- --------- Me 09:00 07:30 08:00 07:00 06:00 00:00 02:00 36:00 Myself 07:30 07:30 07:30 07:30 07:00 00:00 00:00 37...

Read note
MySQL day of week ending on Friday
MySQL 26855

MySQL day of week ending on Friday

Week Ending Date has been requested a lot more frequently now. It's an odd one but the example below shows how to do this for when the week ends on Friday. Assuming it starts on the previous Saturday.

Read note

Working principle

Our Purpose

This site exists as a practical knowledge base built from real-world experience across systems, platforms, and technologies since 1999. Much of the content documents solutions, edge cases, and working patterns that were learned through investigation where documentation was incomplete or absent, and is shared to reduce the same friction for others.

27 Years in IT
1021 CRM clients
810 Site articles
29.7m+ Reads / hits

Knowledge base

Search notes

Find matching words in article titles and content.