SQLite String Functions

The following table shows the commonly used SQLite string functions that operate on an input string and return a new string or a numeric value.

Name	Description
SUBSTR	Extract and return a substring with a predefined length starting at a specified position in a source string
TRIM	Return a copy of a string that has specified characters removed from the beginning and the end of a string.
LTRIM	Return a copy of a string that has specified characters removed from the beginning of a string.
RTRIM	Return a copy of a string that has specified characters removed from the end of a string.
LENGTH	Return the number of characters in a string or the number of bytes in a BLOB.
REPLACE	Return a copy of a string with each instance of a substring replaced by another substring.
UPPER	Return a copy of a string with all of the characters converted to uppercase.
LOWER	Return a copy of a string with all the characters converted to lowercase.
INSTR	Find a substring in a string and return an integer indicating the position of the first occurrence of the substring.
Concatenation Operator \|\|	Concatenate multiple strings into a single string.
CONCAT_WS	Concatenate multiple string into a single string using a specified separator

SELECT INSTR('SQLite String Functions','Functions') Position;

SELECT 
    LENGTH('SQLite');

SELECT
    LOWER('String Functions');

SELECT 
   LTRIM(' SQLite '),
   LENGTH(' SQLite ') LengthBefore,
   LENGTH(LTRIM(' SQLite ')) LengthAfter;

SELECT
   RTRIM(' SQLite '),
   LENGTH(' SQLite ') LengthBefore,
   LENGTH(RTRIM(' SQLite ')) LengthAfter;

SELECT 
    REPLACE('These are string functions', 'These', 'Those');

SELECT 
    SUBSTR('SQLite String Functions', 1, 6);

SELECT 
    TRIM(' SQLite ');

SELECT
    UPPER('String Functions');

This example shows how to concatenate two strings into a single string:

SELECT 'Concatenation ' || 'Operator';

The following statement uses the concat() function to concatenate multiple strings into a single string:

SELECT concat('Hello', ',', ' ', 'World','!') message;

Output:

message
-------------
Hello, World!

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