Database Management Systems
In SQLite, the SQRT() function calculates the square root of a number. It returns the value which, when multiplied by itself, equals the input number.
Note that SQLite returns NULL if you try to calculate the square root of a negative number, NULL, or a value of the wrong type.
Perhaps you’re familiar with MySQL’s SERIAL type, which is not actually a data type, but a shortcut for BIGINT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE.
One restriction of SERIAL is that it forces us to use the BIGINT data type, which is fine if you think you’ll need the extra space. But what if you want the same attributes for a smaller integer type, like INT or MEDIUMINT for example?
Enter SERIAL DEFAULT VALUE.
The ASINH() function in SQLite calculates the inverse hyperbolic sine of a given numeric value. The result is the value whose hyperbolic sine is the specified number.
The PI() function in SQLite returns the mathematical constant π (pi), which is approximately 3.14159265358979. It is used to represent the ratio of the circumference of a circle to its diameter.
The PI() function is commonly employed in mathematical computations, particularly in geometry, trigonometry, and other scientific calculations involving circles and angles.
The COS() function in SQLite calculates the cosine of a given angle. The angle must be specified in radians. The result is the cosine of the angle, which is a real number between -1 and 1.
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.
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.
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.
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.