We all tried various alternative methods for modifying the table structure, but pt-online-schema-change (pt-osc) is the most convenient and preferred method for performing the alter online. It has more granular control too. But it may lead to data loss if proper precautionary steps are not taken care of.

In this blog, we are going to modify a column to a unique key using pt-osc, below I have shared the table structure.

mysql> show create table test\G
* 1. row *
Table: test
Create Table: CREATE TABLE test (
Personid int(11) NOT NULL AUTO_INCREMENT,
LastName varchar(255) NOT NULL,
FirstName varchar(255) DEFAULT NULL,
Age int(11) DEFAULT NULL,
PRIMARY KEY (Personid)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=latin1
1 row in set (0.00 sec)

I have inserted the data of 1000 rows using …

PlanetScale now supports zero downtime data migrations from your existing MySQL Database

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Generally, most all web applications are going to follow the elements of CRUD: Create, Read, Update, and Delete. CodeIgniter 4 is a powerful PHP web development framework that provides a rapid development environment. The CodeIgniter 4 Models come enriched with built-in CRUD functionality, which is covered in this compilation of Medium posts…

Image by Dariusz Sankowski from Pixabay 

Disclaimer: I originally published these articles first over on …

New Oracle survey finds consumers on edge over high prices, out-of-stock products, and delivery delays. More Americans turning to gift cards and even DoorDashing gifts to avoid the holiday hassle.

This Veterans Day, Oracle is offering veterans free training and certification on Oracle Cloud Infrastructure and Oracle Autonomous Database.

This Veterans Day, Oracle is offering veterans free training and certification on Oracle Cloud Infrastructure and Oracle Autonomous Database.

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…

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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