The MOD() function in SQLite is used to calculate the remainder when one number is divided by another. This operation is commonly known as the modulo operation.
Category: DBMS
Database Management Systems
How to Delete an Index in SQLite
If you’ve got an index in a SQLite database that you no longer need, you should probably get rid of it. Keeping unused indexes can be a drag on database performance, especially if your data is being regularly updated.
This article shows you how to delete an index in SQLite.
Continue readingUnderstanding Serverless Databases: Classic Serverless vs Neo-Serverless
The term “serverless database” has gained popularity with the rise of cloud computing and on-demand services, but it has a dual meaning depending on context.
In particular, databases can be “serverless” in either the traditional, client-side manner (e.g., SQLite’s model) or the cloud-native way often associated with managed databases.
This article explores these two approaches to serverless databases—classic serverless and neo-serverless—along with contrasting examples from other database models like client/server architectures.
Continue readingAn Overview of the SINH() Function in SQLite
The SINH() function in SQLite calculates the hyperbolic sine of a value. The hyperbolic sine is a mathematical function that can return any real number and grows exponentially as its input increases or decreases.
A Quick Look at SQLite’s LOG10() Function
The log10() function in SQLite is used to calculate the base-10 logarithm of a number. This function is part of SQLite’s built-in mathematical functions, and it returns the logarithmic value of the argument passed to it.
Understanding the ATAN2() Function in SQLite
The ATAN2() function in SQLite calculates the arc tangent (inverse tangent) of the ratio of two given numeric values, typically representing the y-coordinate and x-coordinate of a point.
Unlike ATAN(), which calculates the angle based only on a single tangent value, ATAN2() considers both the x and y values to determine the correct quadrant for the resulting angle.
List All Prepared Statements in a PostgreSQL Session
Prepared statements are a precompiled SQL queries that we can execute multiple times with different arguments. They are limited to the current session, so we can only create them and run them from within the same session.
Sometimes we might want to review how many prepared statements we’ve created. Or we might need to deallocate one, but we’ve forgotten its name.
No problem. We can use the pg_prepared_statements view to see all of our prepared statements.
A Quick Overview of the ATAN() Function in SQLite
The ATAN() function in SQLite calculates the arc tangent (inverse tangent) of a given numeric value. The result is the angle in radians whose tangent is the specified number.
Create a DEFAULT Constraint in MySQL
In MySQL, a DEFAULT constraint is used to provide a default value for a column when no value is specified during an INSERT operation. This is particularly useful for ensuring that important columns have consistent, non-null values, even when omitted from inserts.
In this article, we’ll use MySQL to create a table with a couple of DEFAULT constraints, and we’ll also add a constraint to that table after it has been created.
Overview of the POWER() Function in SQLite
SQLite provides various mathematical functions out of the box, and one of them is the power() function (also available as pow()).
The power() function calculates the result of raising one number to the power of another. In other words, it performs an exponentiation operation. This function is particularly useful for mathematical operations where powers or exponents are required.