The CHAR_LENGTH(str) function returns string length measured in characters.
A multi-byte character counts as single character such as a string contains 5 two-byte characters, then LENGTH() function returns 10, but the CHAR_LENGTH() returns 5.
CHARACTER_LENGTH(str)
This function is same as CHAR_LENGTH().
Synonym for CHAR_LENGTH.
The LENGTH function returns the length of the string argument in bytes. A multi-byte character counts as multiple bytes. This means that for a string containing a three-byte character, LENGTH() returns 3, whereas CHAR_LENGTH() returns 1. For example:
select length('€');
Returns 3
The is because the Euro sign is encoded as 0xE282AC in UTF-8 and thereby occupies 3 bytes.
A synonym for LENGTH().