Over the weekend, I’ve published the 1st issue of my new weekly free newsletter, OpenLamp.tech. I’m so excited about this newsletter. Read on to learn more…

What is the OpenLamp.tech newsletter

OpenLamp.tech is a free newsletter unlike any other that I’m aware of. If it existed, I would be reading it.

Instead, I created it. Let me explain…

Image by Mahesh Patel from Pixabay

Developer, Writer, …

Hi all, just some words to let you know that FOSDEM’22 will take place February 5th and 6th. Like last year, this 2022 edition will be an online edition.

As MySQL, we have submitted our candidature for a devroom/track. We are waiting for the approval list.

As soon as we know FOSDEM’s decision, the eventual Call-For-Papers will be opened.

Stay tuned.

Meanwhile, enjoy MySQL !

When I went over my example of using the WITH clause to solve how to use a series of literal values in data sets, some students got it right away and some didn’t. The original post showed how to solve a problem where one value in the data set is returned in the SELECT-list and two values are used as the minimum and maximum values with a BETWEEN operator. It used three approaches with literal values:

• A list of Python dictionaries that require you to filter the return set from the database through a range loop and if statement that mimics a SQL BETWEEN operator.
• A WITH clause that accepts the literals as bind variables to filter the query results inside the query.
• A table design that holds the literals values that an analyst might use for reporting.

It was the last example that required elaboration. I explained you might build a web form that uses a table, and the table could allow a …

A few weeks ago and in MySQL 5.7, I had an ALTER TABLE that failed with a duplicate entry error.  This is old news as it is happening since MySQL 5.6, but I only saw this recently because I am normally using online schema change from the Percona Toolkit (pt-osc) or GitHub's online schema migration (gh-ost).  I do not like that and I am disappointed this has not been improved, so this

In October 10th was released the latest GA version of MySQL: 8.0.27.

As usual, it’s highly advised to read the release notes to get informed about the changes and bug fixed.

MySQL is Open Source and each release contains contributions from our great Community. Let me thanks all the contributors on behalf of the entire MySQL Team: Thank you !

MySQL 8.0.27 includes contributions from Adam Cable, Lukasz Sanek, Kaiwang Chen, Shaohua Wang,
Øystein Grøvlen, Zheng Lai, Huqing Yan, Biran Yue, Xiaoyu Wang, Hong Wang,
Kevin Michel, Björn Michael, Kaige Ye, Yubao Liu and Facebook.

Once again, thank you all for your great contributions.

Here is the list of the above contributions and related bugs:

Clients / Connectors

• …

CSV or SQL? SQL or CSV? How about together? Without a doubt, CSV’s are one of the most common and familiar data interchange formats. Importing and exporting CSV data into or out of an SQL database is a staple process in most every data workflow. I’ve written numerous blog posts on both importing and exporting CSV data in an SQL environment. In this post, I am including all of these specific posts (as of the time of writing) in one easy-to-read and centralized location…

Image by xresch from  …

Well, let me say if that happens it’s because there is a logic mistake in your application. But you need to know and understand what happens in MySQL to be able to avoid the problem. 

In short, the WHY of this article is to inform you about possible pitfalls and how to prevent them from causing you damage.

Let us start by having a short introduction to what Repeatable reads are about. Given I am extremely lazy, I am going to use (a lot) existing documentation from the MySQL documentation.

Transaction isolation is one of the foundations of database processing. Isolation is the I in the acronym ACID; the isolation level is the setting that fine-tunes the balance between performance and reliability, consistency, and reproducibility of results when multiple transactions are making changes and performing …

Well, let me say if that happens because there is a logic mistake in your application. But you need to know and understand what happens in MySQL to be able to avoid the problem. 

In short the WHY of this article is to inform you about possible pitfalls and how to prevent that to cause you damage. 

Let us start by having a short introduction to what Repeatable reads are about. Given I am extremely lazy, I am going to use (a lot) existing documentation from MySQL documentation.

Transaction isolation is one of the foundations of database processing. Isolation is the I in the acronym ACID; the isolation level is the setting that fine-tunes the balance between performance and reliability, consistency, and reproducibility of results when multiple transactions are making changes and performing queries at the …

Well, let me say if that happens because there is a logic mistake in your application. But you need to know and understand what happens in MySQL to be able to avoid the problem. 

In short the WHY of this article is to inform you about possible pitfalls and how to prevent that to cause you damage. 

Let us start by having a short introduction to what Repeatable reads are about. Given I am extremely lazy, I am going to use (a lot) existing documentation from MySQL documentation.

Transaction isolation is one of the foundations of database processing. Isolation is the I in the acronym ACID; the isolation level is the setting that fine-tunes the balance between performance and reliability, consistency, and reproducibility of results when multiple transactions are making changes and performing queries at the …

As an example for my class on the usefulness of Common Table Expressions (CTEs), I created three examples with Python. They extend an exercise in Chapter 9 on subqueries from Learning SQL by Alan Beaulieu. All of the examples work with the sakila sample database.

These bullets describe the examples:

1. Uses local variables and a range for loop and if statement that uses the variables to evaluate and add an element to the derived table (or query result set) from MySQL.
2. Uses a CTE with substitution variables from the Python program, which eliminates the need to evaluate and add an element to the query result set because the query does that.
3. Uses a table to hold the variables necessary to evaluate and add the element to the query result set.

This is the first Python program:

# Import the library.
import sys
import …