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.
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.
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.
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.
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.
The ATANH() function in SQLite calculates the inverse hyperbolic tangent of a given numeric value. The result is the value whose hyperbolic tangent is the specified number.
The .changes dot command in SQLite is a helpful utility for developers working with databases, especially when tracking the number of rows affected by SQL statements like INSERT, UPDATE or DELETE.
When used in the SQLite command-line interface, .changes toggles an option that shows the count of modified rows after executing a command.
This article looks at how the .changes command works, how it can be enabled or disabled, and provides an example to illustrate how it works.
The exp() function in SQLite calculates the exponential of a given number, where the base is the mathematical constant e (approximately 2.71828). In other words, it returns e raised to the power of x for a given input x.
This function can be useful in scientific and statistical calculations involving exponential growth, decay, and other natural logarithmic-based transformations.
Continue readingIn SQLite, the LN() function returns the natural logarithm (logarithm to the base e) of a given positive number.
This function is helpful in mathematical calculations involving growth rates, exponential functions, and natural logarithmic transformations.
Continue readingSQLite is a popular, lightweight, SQL-based relational database engine, frequently used in applications where a full database management system isn’t necessary. Among its various features, SQLite offers built-in functions to track the number of changes made to the database during operations, and one of these functions is total_changes().
In this article, we’ll discuss what the total_changes() function does, how it can be used, and provide examples to illustrate its functionality.