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MySQL | LCASE method

Database
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MySQL
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Functions
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String
schedule Mar 10, 2022
Last updated
local_offer MySQL
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MySQL's LCASE(~) method converts the string input to lowercase and returns it.

Parameters

1. str | string

The string to convert to lowercase.

Return value

The input string in lowercase.

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 student first names in lowercase:

SELECT LCASE(fname)
FROM students;
+--------------+
| LCASE(fname) |
+--------------+
| sky |
| ben |
| travis |
| arthur |
| benjamin |
+--------------+

To return 'HELLO' in lowercase:

SELECT LCASE('HELLO');
+----------------+
| LCASE('HELLO') |
+----------------+
| hello |
+----------------+

Binary strings

To perform lowercase conversion with binary strings, the binary string must first be converted to a non-binary string:

SET @city = BINARY 'Tokyo';
SELECT LCASE(@city), LCASE(CONVERT(@city USING utf8mb4));
+----------------------------+-------------------------------------+
| LCASE(@city) | LCASE(CONVERT(@city USING utf8mb4)) |
+----------------------------+-------------------------------------+
| Tokyo | tokyo |
+----------------------------+-------------------------------------+

On the left we see that when LCASE(~) is used with a binary string, the input remains unchanged in the output.

When the binary string is first converted to a non-binary string on the right, the input is converted to lowercase.

robocat
Published by Arthur Yanagisawa
Edited by 0 others
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