MySQL: Order by field size/length

问题

Here is a table structure (e.g. test):

 __________________________________________
| Field Name     | Data Type               |                 
|________________|_________________________|                 
|    id          |   BIGINT (20)           |                 
|________________|_________________________|                 
|    title       |   varchar(25)           |                 
|________________|_________________________|                 
|    description |   text                  |                 
|________________|_________________________|                 

A query like:

SELECT * FROM TEST ORDER BY description DESC;

But I would like to order by the field size/length of the field description. The field type will be TEXT or BLOB.

回答1:

SELECT * FROM TEST ORDER BY LENGTH(description) DESC;

The LENGTH function gives the length of string in bytes. If you want to count (multi-byte) characters, use the CHAR_LENGTH function instead:

SELECT * FROM TEST ORDER BY CHAR_LENGTH(description) DESC;

回答2:

SELECT * FROM TEST ORDER BY CHAR_LENGTH(description);

回答3:

For those using MS SQL

SELECT * FROM TEST ORDER BY LEN(field)

来源：https://stackoverflow.com/questions/2572118/mysql-order-by-field-size-length