search
Search
Unlock 100+ guides
search toc
close
Cancel
Post
account_circle
Profile
exit_to_app
Sign out
What does this mean?
Why is this true?
Give me some examples!
search
keyboard_voice
close
Searching Tips
Search for a recipe:
"Creating a table in MySQL"
Search for an API documentation: "@append"
Search for code: "!dataframe"
Apply a tag filter: "#python"
Useful Shortcuts
/ to open search panel
Esc to close search panel
to navigate between search results
d to clear all current filters
Enter to expand content preview
Doc Search
Code Search Beta
SORRY NOTHING FOUND!
mic
Start speaking...
Voice search is only supported in Safari and Chrome.
Shrink
Navigate to
MySQL
295 guides
keyboard_arrow_down
check_circle
Mark as learned
thumb_up
0
thumb_down
0
chat_bubble_outline
0
Comment
auto_stories Bi-column layout
settings

# MySQL | OCTET_LENGTH method

schedule Aug 12, 2023
Last updated
local_offer
MySQL
Tags
expand_more
mode_heat
Master the mathematics behind data science with 100+ top-tier guides
Start your free 7-days trial now!

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

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

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.

Edited by 0 others
thumb_up
thumb_down
Comment
Citation
Ask a question or leave a feedback...
thumb_up
0
thumb_down
0
chat_bubble_outline
0
settings
Enjoy our search
Hit / to insta-search docs and recipes!