SQLite SUBSTRING() Function
The SQLite SUBSTRING() function is used to extract a substring from a string starting from specified position.
The SUBSTR() function is a synonym of the SUBSTRING() function.
Syntax
SUBSTRING(string, start, length)
Parameters
string |
Required. Specify the string to extract from. If it is a string then characters indices refer to actual UTF-8 characters. If it is a BLOB then the indices refer to bytes. |
start |
Required. Specify the start position. It can be both a positive or negative number.
|
length |
Optional. Specify the number of characters to extract. If omitted, the whole string will be returned (from the start position). If it is a negative number then abs(length) characters preceding the start character are returned. |
Return Value
Returns the substring extracted from specified string.
Example 1:
The example below shows the usage of SUBSTRING() function.
SELECT SUBSTRING('AlphaCodingSkills.com', 1); Result: 'AlphaCodingSkills.com' SELECT SUBSTRING('AlphaCodingSkills.com', 6); Result: 'CodingSkills.com' SELECT SUBSTRING('AlphaCodingSkills.com', 6, 6); Result: 'Coding' SELECT SUBSTRING('AlphaCodingSkills.com', 6, -5); Result: 'Alpha' SELECT SUBSTRING('AlphaCodingSkills.com', -4, 4); Result: '.com' SELECT SUBSTRING('AlphaCodingSkills.com', -4, -6); Result: 'Skills'
Example 2:
Consider a database table called Employee with the following records:
PhoneNumber | EmpID | Address |
---|---|---|
+33-147996101 | 1 | Grenelle, Paris, France |
+31-201150319 | 2 | Geuzenveld, Amsterdam, Netherlands |
+86-1099732458 | 3 | Yizhuangzhen, Beijing, China |
+65-67234824 | 4 | Yishun, Singapore |
+81-357799072 | 5 | Koto City, Tokyo, Japan |
In the query below, the SUBSTRING() function is used to extract the country code from the PhoneNumber column records.
SELECT *, SUBSTRING(PhoneNumber, 2, 2) AS CountryCode FROM Employee;
This will produce the result as shown below:
PhoneNumber | EmpID | Address | CountryCode |
---|---|---|---|
+33-147996101 | 1 | Grenelle, Paris, France | 33 |
+31-201150319 | 2 | Geuzenveld, Amsterdam, Netherlands | 31 |
+86-1099732458 | 3 | Yizhuangzhen, Beijing, China | 86 |
+65-67234824 | 4 | Yishun, Singapore | 65 |
+81-357799072 | 5 | Koto City, Tokyo, Japan | 81 |
❮ SQLite Functions