Robert Sheldon

Robert is a freelance technology writer based in the Pacific Northwest. He’s worked as a technical consultant and has written hundreds of articles about technology for both print and online publications, with topics ranging from predictive analytics to 5D storage to the dark web. He’s also contributed to over a dozen books on technology, developed courseware for Microsoft’s training program, and served as a developmental editor on Microsoft certification exams. When not writing about technology, he’s working on a novel or venturing out into the spectacular Northwest woods.

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13 November 2023
13 November 2023

Getting Started with MongoDB

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MongoDB is a scalable database management system that stores data as documents in a collection, rather than as rows in a table, such as you’d find in a relational database system. A document is an object made up of one or more field and value pairs that contain related data. A field’s value can be … Read more
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25 September 2023
25 September 2023

MySQL joins

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Tables in a MySQL database are commonly related to one another, often in multiple ways, and it is only by linking the tables together that you can derive meaningful information from the data. To connect these tables together, you can use the JOIN clause, which you include in your SELECT, DELETE, or UPDATE statements. The … Read more
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07 September 2023
07 September 2023

Working with MySQL constraints

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MySQL provides a set of constraints that you can include in your table definitions to help ensure the integrity of the data. The constraints let you better control the types of data that can be added to the database. For example, you can use constraints to set a column’s uniqueness or nullability, specify a default … Read more
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15 June 2023
15 June 2023

Working with MySQL transactions

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MySQL transactions provide an effective method for executing multiple statements as a single unit, making it possible to safely modify data, while preventing concurrent users from updating the same data or overwriting changed data. If any statements within a transaction fail or do not achieve their desired results, the changes can be rolled back and … Read more
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02 March 2023
02 March 2023

Retrieving MySQL data from within Python

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Applications of all types commonly access MySQL to retrieve, add, update, or delete data. The applications might be written in Python, Java, C#, or another programming language. Most languages support multiple methods for working with a MySQL database and manipulating its data. The approach you take when accessing MySQL will depend on the programming language … Read more
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05 January 2023
05 January 2023

Introducing the MySQL common table expression

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As with many relational database management systems, MySQL provides a variety of methods for combining data in a data manipulation language (DML) statement. You can join multiple tables in a single query or add subqueries that pull data in from other tables. You can also access views and temporary tables from within a statement, often … Read more
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02 December 2022
02 December 2022

Subqueries in MySQL

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A subquery is a type of query that is embedded—or nested—into a data manipulation language (DML) statement. The data returned by the subquery is passed into the DML statement and incorporated into its overall logic. The subquery itself is typically a SELECT statement, although you can also use a TABLE statement or VALUES statement. Even so, the SELECT statement continues to be the most common choice for subqueries, and that’s the one I focus on in this article.… Read more
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12 November 2022
12 November 2022

Introducing the MySQL DELETE statement

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In the last few articles in this series, you learned about three important data manipulation language (DML) statements: SELECT, INSERT, and UPDATE. The statements make it possible to retrieve, add, and modify data in a MySQL database. Another DML statement that is just as important is DELETE, which lets you remove one or more rows from a table, including temporary tables. In this article, I focus exclusively on the DELETE statement to help round out our discussion on the core DML statements in MySQL. Overall, the DELETE statement is fairly basic, but one that’s no less necessary to have in your arsenal of DML tools. … Read more
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07 October 2022
07 October 2022

Introducing the MySQL INSERT statement

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In the previous article in this series, I introduced you to the SELECT statement, one of several SQL statements that fall into the category of data manipulation language (DML), a subset of statements used to query and modify data. Another DML statement is the INSERT statement, which lets you add data to MySQL tables, both … Read more
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