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MySQL | OCTET_LENGTH method
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schedule Mar 10, 2022
Last updated MySQL
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expand_more MySQL's OCTET_LENGTH(~) method returns the length of a string in bytes.
Parameters
1. str | string
The string whose length we want to return.
Return value
The length of the input string in bytes.
Examples
Consider the following table about some students:
student_id | fname | lname | day_enrolled | age | username |
|---|---|---|---|---|---|
1 | Sky | Towner | 2015-12-03 | 17 | stowner1 |
2 | Ben | Davis | 2016-04-20 | 19 | bdavis2 |
3 | Travis | Apple | 2018-08-14 | 18 | tapple3 |
4 | Arthur | David | 2016-04-01 | 16 | adavid4 |
5 | Benjamin | Town | 2014-01-01 | 17 | btown5 |
The above sample table can be created using the code here.
Basic usage
To return length of student first names in bytes:
SELECT OCTET_LENGTH(fname)FROM students;
+---------------------+| OCTET_LENGTH(fname) |+---------------------+| 3 || 3 || 6 || 6 || 8 |+---------------------+
Each character is represented using 1 byte (8bits) as these are ASCII characters.
To check bytes used to represent the Japanese character 'あ':
SELECT OCTET_LENGTH('あ');
+---------------------+| OCTET_LENGTH('あ') |+---------------------+| 3 |+---------------------+
We can see that the single Japanese character 'あ' is represented using 3 bytes.
Published by Arthur Yanagisawa
Edited by 0 others
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Official MySQL Documentation
https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_octet-length
