MySQL WHERE Clause Equality Comparison Operator

We don’t always need all rows from the table as part of the final results set. You can use one (or more) of the comparison operators to filter the rows with a WHERE clause conditional. In this post, we are looking at the equality comparison operator (=)…

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CodeIgniter 4 Query Builder join() Method Explained

The CodeIgniter 4 Query Builder class provides ORM-like functionality for Database operations in the framework. As developers, we know SQL JOINs are foundational and oftentimes required in order to retrieve the correct data. The Query Builder class has a dedicated join() method you can use when constructing queries where JOINs are necessary. Continue reading and learn how to use the CodeIgniter 4 Query Builder join() method…

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MySQL Count Weekday occurrences

Each SQL dialect is different in some way, shape, form, or fashion from the next flavor. Some dialects have this function, while others have that function. In this post, I cover porting over Oracle SQL to MySQL in order to count the number of occurrences of a specific weekday found in the current given month (at the time of writing) purely as a learning exercise focused on MySQL DATE functions and the WITH clause…

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TRIM() string function in MySQL – with examples.

In this post, I’ll cover examples of the MySQL TRIM() function. TRIM() removes specific characters – or spaces – from a given string, at either: the beginning, ending, or potentially in both locations depending on several factors. With an optional keyword argument that controls which character(s) – if any – are removed, TRIM() can be tricky so let’s gain understanding with several easy-to-digest examples…

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Pivot query in MySQL – Learning by example.

While reading in a fantastic SQL book I frequent quite a bit, I discovered a type of query in one of the examples that I really should know. For a better learning experience, in order to solidly the concepts presented, I applied them to some data that I am familiar with. The topic: pivoting rows of data. Although I am aware of this data presentation, I have never studied a pivot query. ‘So why not learn it then’ I thought to myself. Are you interested in learning about a pivot query also? Continue reading and see an easy-to-comprehend example…

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