chevron_left
String
Method ASCIIMethod BINMethod BIT_LENGTHMethod CHARMethod CHAR_LENGTHMethod CHARACTER_LENGTHMethod CONCATMethod CONCAT_WSMethod ELTMethod EXPORT_SETMethod FIELDMethod FIND_IN_SETMethod FORMATMethod FROM_BASE64Method HEXMethod INSERTMethod INSTRMethod LCASEMethod LEFTMethod LENGTHMethod LOAD_FILEMethod LOCATEMethod LOWERMethod LPADMethod LTRIMMethod MAKE_SETMethod MIDMethod OCTMethod OCTET_LENGTHMethod ORDMethod POSITIONMethod QUOTEMethod REPEATMethod REPLACEMethod REVERSEMethod RIGHTMethod RPADMethod RTRIMMethod SOUNDEXMethod SPACEMethod STRCMPMethod SUBSTRMethod SUBSTRINGMethod SUBSTRING_INDEXMethod TO_BASE64Method TRIMMethod UCASEMethod UNHEXMethod UPPERMethod WEIGHT_STRING
0
0
0
new
MySQL | OCTET_LENGTH method
Database
chevron_rightMySQL
chevron_rightDocumentation
chevron_rightFunctions
chevron_rightString
schedule Mar 10, 2022
Last updated MySQL
Tags tocTable of Contents
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
Did you find this page useful?
Ask a question or leave a feedback...
Official MySQL Documentation
https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_octet-length