The Ultimate Guide to High Availability with MariaDB

LENGTHB

Syntax

LENGTHB(str)

Description

LENGTHB() returns the length of the given string, in bytes. When Oracle mode is not set, this is a synonym for LENGTH.

A multi-byte character counts as multiple bytes. This means that for a string containing five two-byte characters, LENGTHB() returns 10, whereas CHAR_LENGTH() returns 5.

If str is not a string value, it is converted into a string. If str is NULL, the function returns NULL.

Examples

When Oracle mode from MariaDB 10.3 is not set:

SELECT CHAR_LENGTH('π'), LENGTH('π'), LENGTHB('π'), OCTET_LENGTH('π');
+-------------------+--------------+---------------+--------------------+
| CHAR_LENGTH('π')  | LENGTH('π')  | LENGTHB('π')  | OCTET_LENGTH('π')  |
+-------------------+--------------+---------------+--------------------+
|                 1 |            2 |             2 |                  2 |
+-------------------+--------------+---------------+--------------------+

In Oracle mode from MariaDB 10.3:

SELECT CHAR_LENGTH('π'), LENGTH('π'), LENGTHB('π'), OCTET_LENGTH('π');
+-------------------+--------------+---------------+--------------------+
| CHAR_LENGTH('π')  | LENGTH('π')  | LENGTHB('π')  | OCTET_LENGTH('π')  |
+-------------------+--------------+---------------+--------------------+
|                 1 |            1 |             2 |                  2 |
+-------------------+--------------+---------------+--------------------+

See Also

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