SQLite Expression Based Index Restriction

Introduction to the SQLite expression-based index

INDEX in SQLite is a table-like structure that holds the name of the row and the row ID of a table, not the entire rows and columns. The index is a lightweight table, which helps the developers to improve the performance of the Table. INDEX helps in a faster and smoother data-retrieval process. Creating an INDEX of a SQLite table where data retrieval is done frequently is always recommended. Expression-based INDEX in SQLite improves the performance of the complex SQLite statements that use any Expressions....

Prerequisite

Users must be familiar with SQLite INDEX and the basic commands of SQLite such as INSERT, CREATE etc....

How Expression-Based Index Work?

For this example, we will be using a table called Students which is already being populated with values. We will create an Expression-Based INDEX over that table and use one of it’s column by passing it inside a function....

SQLite Expression Based Index Restriction

Although Expression-Based INDEX is useful for SQLite and increase the speed of data retrieval process, there are certain restrictions which comes with it’s benefits. Those are listed below:...

Conclusion

As we saw in this article, how the Expression Based INDEX differs from that of the normal SQLite INDEX. We also saw when and how to use it, the benefits of using it and also the restrictions of using Expression-Based INDEX. Althought this can be very useful when it comes to increase the speed of data retrieval process, it makes the entire SQLite statement a little-bit complex and hard to understand, especially for those who are new to SQLite....