SQLite string functions are used to perform various operations on strings such as calculating the length of a string concatenating two strings or extracting a substring from a larger string. These functions are very useful when working with databases that contain textual data.SQLite is a relational database management system (RDBMS) contained in a C programming library. In contrast to many other database management systems SQLite is not a client–server database engine. Rather it is embedded into the end program. SQLite has bindings for many programming languages like C# Java Objective-C and PHP.SQLite supports most of the query language features found in other relational database systems. However SQLite uses a dynamic type system that allows it to store values of any type. It also supports user-defined functions and extensions.The string functions in SQLite are:substr(string start length) - returns a substring of the given string starting at the given start position for the given length; if length is omitted then the rest of the string starting at start is returnedlength(string) - returns the length of the given string in charactersinstr(string1SQLite string functions are used to perform various operations on string data such as trimming concatenating changing case and more. These functions make it easy to manipulate string data in the database. Some of the most commonly used SQLite string functions are: SQLite string functions are used to perform various operations on string data. These functions can be used to perform case-insensitive comparisons extract substrings compute levenshtein distance etc. SQLite also provides a number of built-in functions for dealing with binary data.