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MySQL:
LENGTH
Syntax:
LENGTH(str)
Returns the length of the string str, measured in bytes. A multibyte
character counts as multiple bytes. This means that for a string
containing five 2-byte characters, LENGTH() returns 10, whereas
CHAR_LENGTH() returns 5.
URL: https://dev.mysql.com/doc/refman/8.0/en/string-functions.html
Example
mysql> SELECT LENGTH('text');
-> 4
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