[MySQL] length() vs char_length()

LENGTH function returns the length of the string measured in bytes.

CHAR_LENGTH() returns the length of the string measured in characters.

1. LENGTH() : 길이를 bytes로 나타낸다.

SELECT LENGTH(‘한글’) -> 6

SELECT LENGTH(‘abc’) -> 3

2. CHAR_LENGTH() : 글자의 수를 나타낸다.

SELECT CHAR_LENGTH(‘한글’) -> 2

SELECT CHAR_LENGTH(‘abc’) -> 3

3. BIT_LENGTH() : 길이를 bit로 나타낸다.

SELECT BIT_LENGTH(‘한글a’) -> 56

SELECT BIT_LENGTH(‘한글’) -> 48

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