MySQL | LCASE method
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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.
