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  • LOWER(str) mysql function

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    LOWER(str)

    LOWER(str) function returns the string str with all characters changed to lowercase according to the current character set mapping. The default character set is latin1 (cp1252 West European).

    Here is a example of this function-

    mysql> SELECT LOWER('Hello MySQL');
    +----------------------+
    | LOWER('Hello MySQL') |
    +----------------------+
    | hello mysql          |
    +----------------------+
    1 row in set (0.00 sec)
    

    MySQL LOWER() function is ineffective when applied to binary strings (BINARY, VARBINARY, BLOB). To perform letter case conversion, convert the string to a nonbinary string:

    I am explaining this by a example-

    mysql> SET @str = BINARY 'Hello MySQL';
    Query OK, 0 rows affected (0.00 sec)
    
    mysql> SELECT LOWER(@str), LOWER(CONVERT(@str USING latin1));
    +-------------+-----------------------------------+
    | LOWER(@str) | LOWER(CONVERT(@str USING latin1)) |
    +-------------+-----------------------------------+
    | Hello MySQL | hello mysql                       |
    +-------------+-----------------------------------+
    1 row in set (0.00 sec)
    

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