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MySQL | ASCII method

schedule Aug 12, 2023
Last updated
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MySQL
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MySQL's ASCII(~) method returns the ASCII numeric value of the leftmost character in the provided input string.

Parameters

1. str | string

The string for which the leftmost character's ASCII numeric value will be returned.

Return value

ASCII numeric value of the leftmost character in the input string.

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 ASCII value for the first character of student first names:

SELECT fname, ASCII(fname)
FROM students;
+----------+--------------+
| fname | ASCII(fname) |
+----------+--------------+
| Sky | 83 |
| Ben | 66 |
| Travis | 84 |
| Arthur | 65 |
| Benjamin | 66 |
+----------+--------------+

For first name 'Sky' the left most character 'S' has ASCII numeric value of 83.

Empty string input

If the input string is empty 0 is returned:

SELECT ASCII('');
+-----------+
| ASCII('') |
+-----------+
| 0 |
+-----------+

NULL input

If the input string is NULL, NULL is returned:

SELECT ASCII(NULL);
+-------------+
| ASCII(NULL) |
+-------------+
| NULL |
+-------------+
robocat
Published by Arthur Yanagisawa
Edited by 0 others
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