SQL

How to find the first and last day of a month with Oracle SQL Date Functions – Medium cross post

I recently wrote a blog post on porting over Oracle SQL to comparable MySQL queries with the purpose of counting specific weekdays occurrences in a given month. That post was inspired by this YouTube video (which I highly recommend). I published a post over on Medium about some of the Oracle Date functions available for these types of queries as I learn more Oracle SQL and wanted to share it with readers here who may be interested…

Digital calendar on a tablet on a table.
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In order to count pretty much anything in a month, you need to know how many days there are in the month. With the first and last day of the month values, you can subtract one from the other and find out the number of days.

Oracle SQL has many powerful DATE functions available for a wide range of calculations. In the post, How to find the first and last day of a month using Oracle SQL Date Functions , I use varying combinations of 4 different DATE functions to determine the first and last day of a given month. As an added bonus, I also explore both the previous and following months first and last day values relative to the current month.

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Josh Otwell has a passion to study and grow as a SQL Developer and blogger. Other favorite activities find him with his nose buried in a good book, article, or the Linux command line. Among those, he shares a love of tabletop RPG games, reading fantasy novels, and spending time with his wife and two daughters.

Disclaimer: The examples presented in this post are hypothetical ideas of how to achieve similar types of results. They are not the utmost best solution(s). The majority, if not all, of the examples provided, is performed on a personal development/learning workstation-environment and should not be considered production quality or ready. Your particular goals and needs may vary. Use those practices that best benefit your needs and goals. Opinions are my own.

MySQL Simple CASE Expression – with examples

Programming logic is foundational in any application or piece of software. Without it, software wouldn’t really do much of anything. Everything happens off of choice. In the end, some truthy or falsy value is what makes stuff work. For IF/THEN/ELSE logic in standard SQL, there is the CASE expression. There are 2 variations of the CASE Expression: Simple and Searched. In this post, I cover the Simple MySQL CASE expression with example queries…

[Keep reading for more MySQL database and Python/PHP-centric content >>>]

MySQL Column Aliases using the AS keyword

Be it running reports or displaying data in some other visualization, SQL SELECT column expressions should be meaningful and understandable. To provide those valuable query results, SQL Developers, use a multitude of available functions, adjacent columns, or other means not readily apparent to end-users. All that being said, the column names often suffer the most as far as readability is concerned, taking on long function call names or other combined expressions. But, as luck would be on our side, there is an easy fix and that is aliasing columns using the AS keyword. Although AS is optional – in this particular context – I err on the side of readability and use it when aliasing SELECT column expressions.

[Keep reading for more SQL database and PHP/Python-centric content >>>]

Comparing SQLite and Realm: What Is the Best Database for Android

Any Android application requires dedicated storage space. And various databases help developers in this. However, a lot depends on the choice of the database, and the wrong choice can bury the perfect application. When creating an app for Android, there are two most popular databases SQLite and Realm. Many developers cannot choose between them for a long time since each has its own pros and cons. Today we will compare these two databases and find out what is better for developing Android applications. Without further ado, let’s get started.

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How to Use SQL in SEO

If you talk to any search engine optimization specialist, they’ll surely tell you how many tools are used throughout their workday – from keyword research and backlinking to crawling and metric analysis tools. SEO is a world of its own with countless facets of information that need tweaking and examination constantly. It can quickly become overwhelming if you don’t have the right tools at your disposal. Or if you simply don’t understand how to make your job easier with SQL. 

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