MySQL - How to select data by string length

You are looking for CHAR_LENGTH() to get the number of characters in a string.

For multi-byte charsets LENGTH() will give you the number of bytes the string occupies, while CHAR_LENGTH() will return the number of characters.

select * from table order by length(column);

Documentation on the length() function, as well as all the other string functions, is available here.

Having a look at MySQL documentation for the string functions, we can also use CHAR_LENGTH() and CHARACTER_LENGTH() as well.