A Quick Look at EXP() in SQLite

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.

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Understanding the total_changes() Function in SQLite

SQLite 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.

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An Overview of Dot Commands in SQLite

SQLite is a lightweight, self-contained, and highly reliable SQL database engine used widely for developing and testing small-scale applications. One unique feature of SQLite is the set of “dot commands” used in the SQLite command-line interface (CLI) to execute various actions related to database management, navigation, and configuration.

These dot commands are not part of SQL syntax itself but provide a convenient way to manage and interact with SQLite databases.

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Fix “Violation of PRIMARY KEY constraint” in SQL Server (Error 2627)

If you’re getting an error that reads something like “Violation of PRIMARY KEY constraint ‘PK_CatId’. Cannot insert duplicate key in object ‘dbo.Cats’. The duplicate key value is (1)” in SQL Server, it’s because you’re trying to insert a duplicate value into a primary key column.

A primary key cannot contain duplicate values.

To fix this issue, you’ll need to change the value you’re trying to insert into the primary key column.

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How to Create an Index in SQLite

In database management systems (DBMSs) such as SQLite, indexes can be used to optimize the performance of queries, especially for larger datasets where querying can become time-consuming. An index allows the database to locate rows more quickly without scanning every row in a table.

This article explains how to create an index in SQLite, along with a simple example.

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Get the IDENTITY Values that were Generated by an INSERT Statement in SQL Server

The good thing about having IDENTITY columns in SQL Server is that they automatically generate a unique value for every row that’s inserted into a table. This saves us from having to insert our own unique values, and I’m not going to complain about that.

But obvious question you might ask; What if I need to know the value that was generated for each column I just inserted?

Fortunately, the solution may be easier than you think!

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