Technical Content Manager

James Gallagher is a self-taught programmer and the technical content manager at Career Karma. He has experience in range of programming languages and extensive expertise in Python, HTML, CSS, and JavaScript. James has written hundreds of programming tutorials, and he frequently contributes to publications like Codecademy, Treehouse, Repl.it, Afrotech, and others. He also serves as a researcher at Career Karma, publishing comprehensive reports on the bootcamp market and income share agreements.

Python Convert List to Dictionary: A Complete Guide

You can convert a Python list to a dictionary using a dictionary comprehension, dict.fromkeys(), or the zip() method. All three methods create a new dictionary. They do not modify the existing list. Python lists and dictionaries are two structures used…

Replace Item in List in Python: A Complete Guide

There are three ways to replace an item in a Python list. You can use list indexing or a for loop to replace an item. If you want to create a new list based on an existing list and make…

Python Dictionary Values: A Guide

The Python dictionary values() method returns an object containing the values in a dictionary. This method is useful if you want to iterate over only the values in the dictionary. If you change a dictionary later, the data stored in…

SQL Subquery: A Complete Guide

An SQL subquery is a query inside another query. It is used in the WHERE or HAVING clause of an SQL statement. Subqueries let you specify the results of one query as an argument in another query. When you’re writing…

SQL Aliases: A Complete Guide

An SQL alias is a reference name for a table or a column. They are used to shorten your queries if you have long table names. Both table and column aliases are defined using the AS keyword. An alias lasts…

SQL Left Join: A Complete Guide

An SQL LEFT JOIN is a type of SQL join. This join returns all the tables from a specified “left” column and the corresponding rows that match a particular condition in the “right” column. In many cases, when you’re writing…

SQL ORDER BY: A Complete Guide

The SQL ORDER BY statement determines the order in which records are returned by a query. You can return records in ascending or descending order by the value of any column in the table. Ordering query results makes it easier…

SQL INNER JOIN: A Complete Guide

The SQL INNER JOIN statement returns rows with exact values in two columns across two tables. You can join a table across one or multiple columns. JOIN statements connect two database tables and compare their contents. There may be times…

SQL Aggregate Functions: A Complete Guide

SQL aggregate functions retrieve information about the data in a database. You can use COUNT to find out how many records are in a database, for instance. Accepted aggregate functions are: COUNT, MIN, MAX, AVG, and SUM. There are occasions…

SQL Group By: A Complete Guide

The SQL GROUP BY statement appears in aggregate functions. It is used to collate the data you select from a query by a particular column. You can specify multiple columns which will be grouped using the GROUP BY statement. When…

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