Learn how to build a Nest.js API connect it to a MySQL database add a schema and data and and run database queries.

In this tutorial, we’ll be going over every step of how to install MySQL on AlmaLinux. Database servers are the ...

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SQLAlchemy is a popular Python library that gives you many tools to interact with SQL databases. With SQLAlchemy, you can do things like send raw queries to a database, programmatically construct SQL statements, and even map Python classes to database tables with the object-relational mapper (ORM). SQLAlchemy doesn't force you to use any particular features, so it has the flexibility to support many different approaches to working with databases. You can use SQLAlchemy for one-off scripts, web apps, desktop apps, and more. Anywhere that you'd use a SQL database along with Python, you can use SQLAlchemy. This tutorial will cover setting up an engine object in Python SQLAlchemy 2.0, which is the first step to using SQLAlchemy. Then, it will cover two specific ways of interacting with a database: with raw SQL statements and by using the object-relational mapper. This tutorial covers the most recent version of SQLAlchemy, which is 2.0, as of writing …

Choosing a data store is one of the most important decisions you'll make when building software applications. The good and bad news though, is that there is an abundance of options. Depending on the type of application you're building, you may opt for a relational database like MySQL or Postgres, a non-relational database like MongoDB or CouchDB, a graph database like Neo4j, or one of the many other alternatives that each bring their own benefits and drawbacks. It is a difficult choice and sometimes you realize that the database you initially went with no longer serves the needs of your application and you have to make the choice to migrate. In this blog post, we'll take a look at how you can migrate your database schema from PostgreSQL to MySQL. MySQL and PostgreSQL or Postgres are both relational databases that have a lot of similarities, but also have a fair amount of differences that can make migration a challenge. A detailed list of the …

While MySQL error codes are useful, understanding what they mean can be difficult. This article looks at common MySQL error codes, non-coded errors, and how to fix them. MySQL error code format Each MySQL error includes: An error number: A MySQL-specific number corresponding to a particular error. An SQLSTATE value: A five-character string that indicates the error condition. An error message: A textual description of the error. MySQL error example Here’s an example of what a MySQL error code looks like:ERROR 1146 (42S02): Table 'test.no_such_table' doesn't exist

In the error above: 1146 is the error number. 42S02 is the SQLSTATE value. Table test.no_such_table doesn't exist is the error message. Common MySQL error codes Let’s explore some common error codes, what they mean, and how to resolve them. Error 1040: Too many connections Error 1040 occurs when MySQL reaches the maximum number of client connections, forcing you to close …

In this blog post, we are going to show you how to fix corrupted tables in MySQL. MySQL is an ...

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Relational databases, such as MySQL, give you the ability to organize data into separate tables, but link the tables together to form relationships when necessary. MySQL joins give you the ability to link data together in a MySQL database. A join is a way to get columns from more than one table into a single set of results. This is usually much more efficient than trying to perform multiple queries and combining them later. This article looks at the different types of joins that can be performed in MySQL and goes over the different options you have to combine data from multiple tables: inner joins, left and right joins, and full outer joins. A base example of MySQL joins To further our understanding of joins, we’ll create a simple database of grocery items, each item having a category. Categories are stored in the categories table and items are stored in a separate items table.CREATE TABLE categories ( id int PRIMARY KEY AUTO_INCREMENT, name …

Learn how and when to use inner joins outer joins left joins and right joins.

Overview One of the best things the DevOps movement has ushered in is the concept of Infrastructure as Code. IaC lets you define your infrastructure in specially formatted files, and allows you to use automation tools to create or modify your infrastructure based on those files. But did you know that you can also manage your database schemas in a similar approach? Atlas CLI is a command line tool that helps manage the structure of your database by keeping a representation of the schema in a file. It can be used by itself to manage your schema changes, or as part of a CI/CD pipeline to automate the process of updating your schema based on the definition file. In this article, we’ll cover the basics of using Atlas CLI to generate a schema definition file, as well as updating the schema of a PlanetScale database using the tool. To follow along, you should have the following: A PlanetScale account. The PlanetScale CLI installed and configured. The …

Connect a Python app to MySQL database with mysqlclient mysql-connector-python PyMySQL and aiomysql.