PostgreSQL LENGTH() Function

The PostgreSQL LENGTH() function returns the length of the specified string (measured in bytes). This function counts a multi-byte character as a single character.

Note: To count a multi-byte character as more than one byte, OCTET_LENGTH() function can be used.

Syntax

LENGTH(string)

Parameters

string Required. Specify the string to return the length for.

Return Value

Returns the length of the specified string (measured in bytes).

Example 1:

The example below shows the usage of LENGTH() function.

SELECT LENGTH('12345');
Result: 5

SELECT LENGTH('ABCDE');
Result: 5

SELECT LENGTH('AlphaCodingSkills');
Result: 17

SELECT LENGTH('Alpha Coding Skills');
Result: 19

SELECT LENGTH(NULL);
Result: NULL

SELECT LENGTH('');
Result: 0

SELECT LENGTH(' ');
Result: 1

Example 2:

Consider a database table called Employee with the following records:

EmpID	Name	City	Age	Salary
1	John	London	25	3000
2	Marry	New York	24	2750
3	Jo	Paris	27	2800
4	Kim	Amsterdam	30	3100
5	Ramesh	New Delhi	28	3000
6	Huang	Beijing	28	2800

The statement given below can be used to get the length of records of City column.

SELECT *, LENGTH(City) AS LENGTH_Value FROM Employee;

The query will produce the following result:

EmpID	Name	City	Age	LENGTH_Value
1	John	London	25	6
2	Marry	New York	24	8
3	Jo	Paris	27	5
4	Kim	Amsterdam	30	9
5	Ramesh	New Delhi	28	9
6	Huang	Beijing	28	7

❮ PostgreSQL Functions