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Databases: MySQL and PostgreSQL Technical Manuals (New)

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  • How to Install MySQL on Linux Mint 20 and Ubuntu 20.04?

    MySQL is an open-source, simple, and relational database that uses SQL (Structured Query Language) to manage and manipulate the data.

  • MySQL Add a Column to Existing Table

    MySQL Database System is a highly scalable database service for creating cloud-native applications. Therefore we have to perform different operations while working on it. The ALTER TABLE declaration is being cast-off to add, remove, or alter columns while working on an already existing table in any schema of MySQL. We’ll teach you exactly how to declare a column to an existing table utilizing the MySQL ADD COLUMN expression in this guide.

  • MySQL Count Matching Records With COUNT

    Data redundancy occurs for a lot of reasons. Several of the complicated duties you should cope with while working with database systems is trying to discover duplicate values. For this purpose, We will be using the COUNT() aggregate method. The COUNT() method returns the sum of rows residing in a specific table. The COUNT() function permits you to sum all rows or only rows matching the condition defined. In this guide, You’ll get to know how to identify duplicate values for one or maybe more MySQL columns using COUNT().

  • MYSQL Import Data from CSV File – Linux Hint

    A CSV or comma-separated value document is a delineated text document that distinguishes values from a comma. Every line is its information record. Each data, parted by commas, comprises one or extra fields. The origin of the title for this document layout is the usage of the comma as a field divider. For sharing information between various programs, such documents are used. For instance, Database and contact administrators also endorse CSV files. The theory is that from one program to a CSV document, you may transfer complex information and afterward import the information in that CSV document to some other program. In this tutorial, we will learn how to import data from a CSV file into MySQL workbench. Let’s get started.

  • MYSQL Find Matching Records with LIKE – Linux Hint

    The MySQL LIKE operator tests if a particular character string resembles the pattern mentioned. We will match a portion of the overall data present in a segment that doesn’t need to match precisely. We will cup tie our keyword with the sequence of the information available in columns by using wildcard query in various combinations. MySQL Wildcards are symbols that help match difficult criteria with search results and have been used in combination with a compare operator called LIKE or a contrast operator called NOT LIKE.

  • MySQL Limit Results Returned With LIMIT – Linux Hint

    You eventually hit the stage where data volume greatly increases when we start to deal with DBMS like MySQL. It is difficult for us to manage and use. MySQL has built-in capabilities that make it easy to handle. In MySQL, the LIMIT clause is being used to cut down the number of rows throughout the result set using the SELECT expression. We will discover how to use the MySQL LIMIT clause in this guide to restrict the number of rows that a query returns.

  • MySQL Sort Results with ORDER BY Statement – Linux Hint

    While working with MySQL queries, the results are obtained in the same sequence as the records inserted into the schema utilizing the SELECT command. It’s the standard order for sorting. You would be aiming at how we might arrange our query result. Sorting is re-arranging the outputs of our query in a defined manner. Sorting may be done on one field or more than one field. The ORDER BY statement is being used to arrange the query results in an ascending or descending order in MySQL. The ORDER BY statement organizes data by default in go-up order if ASC or DESC is not specified. The DESC term is being used to organize the data in descending way.

  • MySQL Subqueries – Linux Hint

    A subquery is a SQL query within a greater query that is recursive, or a subquery is considered an internal query. In contrast, an outer query is termed as the query that includes the subquery. A MySQL subquery can be embedded in the queries, including SELECT, INSERT, UPDATE, or DELETE. Furthermore, within another subquery, a subquery may be nestled. The phrase subquery should be closed in brackets wherever it is used. We’ll teach you how and when to use MySQL subquery to compose complicated queries and describe the idea of the associated subquery. Open the command-line shell from your desktop and write your password to start using it. Press Enter and continue.

  • PostgreSQL FAQs – Linux Hint

    According to StackOverflow’s 2020 Annual Developer Survey, PostgreSQL is the second most popular database management system available, and this is not without good reason. Since its initial release in 1996, PostgreSQL, or Postgres, has improved considerably, adding several useful features, including user-defined types, table inheritance, multi-version concurrency control, and more.
    PostgreSQL is also very lightweight, easy to set up, and can be installed on several platforms, such as containers, VMs, or physical systems. Besides its default GUI, pgAdmin, Postgres also supports over 50 other IDEs, a third of which are free to use. This article will cover some of the most frequently asked questions (FAQs) about PostgreSQL.

More in Tux Machines

Free Software and More

  • The Apache News Round-up: week ending 15 October 2021

    Happy Friday, everyone. The Apache community has had another great week.

  • The Intelligent Edge – Coming Soon to Arm DevSummit 2021 [Ed: What a ridiculous coredump of mindless buzzwords by SUSE]

    For those of us not keeping score, we’re at the cusp of a technology shockwave that will fundamentally change the way we live, work, and interact with each other. Some call it the fourth industrial revolution (I4). While the third industrial revolution was all about process and product automation, the fourth industrial revolution (from an IT perspective) will center on the fusion of IT and OT.

  • Five of Monday's 'All Things Open' Presentations We Wouldn't Miss - FOSS Force

    If you couldn’t make it to Raleigh, North Carolina to attend this year’s All Things Open, you’re in luck. You can go to the conference’s web site and register for the free online version of the event, which will include live streaming of all presentations happening at the event (including all keynotes), as well as a large number of prerecorded presentations that were put together specifically for the online audience. That’s how we at FOSS Force are planning on attending this year, although downtown Raleigh is only a couple of hours away by car.

  • Community Member Monday: Hlompho Mota

    I am a native of Lesotho, and a dreamer and a person who aspires to make changes. Currently I’m working in a business that serves other businesses in Lesotho to get recognition in the market, and generally grow to become more self-reliant. Other than my business, I do try and dabble in technology and try to understand how it works – and get a sense on how it can be relevant in the area of life that I live in at this moment. But besides that, I consider myself as lifelong learner and I hope that the learning will continue for the rest of my life. Currently, I’m a self-taught developer trying to participate in as many open-source projects as possible, with the hope of bringing much-needed development to my part of the world.

Programming Leftovers

  • Use KPNG to Write Specialized kube-proxiers

    The post will show you how to create a specialized service kube-proxy style network proxier using Kubernetes Proxy NG kpng without interfering with the existing kube-proxy. The kpng project aims at renewing the the default Kubernetes Service implementation, the "kube-proxy". An important feature of kpng is that it can be used as a library to create proxiers outside K8s. While this is useful for CNI-plugins that replaces the kube-proxy it also opens the possibility for anyone to create a proxier for a special purpose.

  • Dirk Eddelbuettel: dang 0.0.14: Several Updates

    A new release of the dang package arrived at CRAN a couple of hours ago, exactly eight months after the previous release. The dang package regroups a few functions of mine that had no other home as for example lsos() from a StackOverflow question from 2009 (!!), the overbought/oversold price band plotter from an older blog post, the market monitor from the last release as well the checkCRANStatus() function recently tweeted about by Tim Taylor. This release regroups a few small edits to several functions, adds a sample function for character encoding reading and conversion using a library already used by R (hence “look Ma, no new depends”), adds a weekday helper, and a sample usage (computing rolling min/max values) of a new simple vector class added to tidyCpp (and the function and class need to get another blog post or study …), and an experimental git sha1sum and date marker (as I am not the fan of autogenerated binaries from repos as opposed to marked released meaning: we may see different binary release with the same version number).

  • Rakudo Weekly News: 2021.42 Learning With

    Daniel Sockwell was inspired by a blog post a few weeks ago about a bouncing balls demo. The result is a new framework for learning Raku, but this time with some nice graphics: Learn Raku With: HTML Balls. Apart from the technical points, it’s also a great way (for people without much programming experience) to get involved with Raku while creating graphics and animations, rather than textual output. Check it out!

  • Russ Allbery: rra-c-util 10.0

    It's been a while since I pushed out a release of my collection of utility libraries and test suite programs, so I've accumulated quite a lot of chanages. Here's a summary; for more, see the NEWS file.

  • 1.56.0 pre-release testing | Inside Rust Blog

    The 1.56.0 pre-release is ready for testing. The release is scheduled for this Thursday, October 21th. Release notes can be found here.

  • Apple Announces The M1 Pro / M1 Max, Asahi Linux Starts Eyeing Their Bring-Up

    Apple today announced the M1 Pro and M1 Max as their most powerful SoCs ever built by the company. The new chips feature up to a 10-core processor, 32-core GPU, and up to 64GB of unified memory. While the Apple M1 was already well regarded for its speed, the M1 Pro and M1 Max are said to deliver up to 70% faster CPU performance than last year's M1. Meanwhile the GPU within the M1 Pro is up to 2x faster than the M1 while the M1 Max's GPU is said to be 4x faster.

Mozilla Firefox: Spyware, Password Loggers, and Performance Monitoring

  • This Week in Glean: Designing a telemetry collection with Glean

    (“This Week in Glean” is a series of blog posts that the Glean Team at Mozilla is using to try to communicate better about our work. They could be release notes, documentation, hopes, dreams, or whatever: so long as it is inspired by Glean.) All “This Week in Glean” blog posts are listed in the TWiG index). Whenever I get a chance to write about Glean, I am usually writing about some aspects of working on Glean. This time around I’m going to turn that on its head by sharing my experience working with Glean as a consumer with metrics to collect, specifically in regards to designing a Nimbus health metrics collection. This post is about sharing what I learned from the experience and what I found to be the most important considerations when designing a telemetry collection. I’ve been helping develop Nimbus, Mozilla’s new experimentation platform, for a while now. It is one of many cross-platform tools written in Rust and it exists as part of the Mozilla Application Services collection of components. With Nimbus being used in more and more products we have a need to monitor its “health”, or how well it is performing in the wild. I took on this task of determining what we would need to measure and designing the telemetry and visualizations because I was interested in experiencing Glean from a consumer’s perspective.

  • Firefox Add-on Reviews: How to choose the right password manager browser extension

    All good password managers should, of course, effectively secure passwords; and they all basically do the same thing—you create a single, easy-to-remember master password to access your labyrinth of complex logins. Password managers not only spare you the hassle of remembering a maze of logins; they can also offer suggestions to help make your passwords even stronger. Fortunately there’s no shortage of capable password protectors out there. But with so many options, how to choose the one that’ll work best for you? Here are some of our favorite password managers. They all offer excellent password protection, but with distinct areas of strength.

  • Mozilla Performance Blog: Performance Sheriff Newsletter (September 2021)

    In September there were 174 alerts generated, resulting in 23 regression bugs being filed on average 6.4 days after the regressing change landed. Welcome to the September 2021 edition of the performance sheriffing newsletter. Here you’ll find the usual summary of our sheriffing efficiency metrics. If you’re interested (and if you have access) you can view the full dashboard.

Red Hat/Fedora Leftovers

  • The NeuroFedora Blog: Next Open NeuroFedora meeting: 25 October 1300 UTC

    Please join us at the next regular Open NeuroFedora team meeting on Monday 25 October at 1300UTC in #fedora-neuro on IRC (Libera.chat). The meeting is a public meeting, and open for everyone to attend.

  • Real-time Analytics News for Week Ending October 16 - RTInsights

    In this week’s real-time analytics news: Red Hat announced updates in its portfolio of tools and programs for building applications on Red Hat OpenShift, and more. Keeping pace with news and developments in the real-time analytics market can be a daunting task. We want to help by providing a summary of some of the items our staff came across each week. Here are some of the news items from this week: Red Hat announced a series of updates in its portfolio of developer tools and programs for developers building applications on Red Hat OpenShift. The updates were to Red Hat OpenShift Pipelines, Red Hat OpenShift GitOps, and the Red Hat build of Quarkus. Additionally, Red Hat expanded the roster of training resources available on Kube By Example.

  • What I learned about Kubernetes and Knative Serverless

    If you happened to miss this year’s Kubernetes Summer Camp, there’s some good news! The sessions were recorded and are available for on-demand viewing. Along with those, you’ll also get access to a variety of downloadable content, including a free O’Reilly e-book.

  • Awards roll call: August to October 2021 [Ed: Those accolades and fake rewards/awards can easily be bought; they let you game the system for money]

    From workplace accolades to product wins, we are proud to be able to highlight some aspects of our company and the recognition they’ve received in the past few months. We recently published our DEI Statement, which declares our commitment to diversity, equity and inclusion—not just for our associates, but for our partners, customers and open source contributors. Our culture is rooted in transparency, collaboration, and inclusion—open source principles that continue to drive our company forward. We see the following awards as a recognition of our open source-driven innovation, where the best ideas can come from anywhere and anyone.