如何使用SQL在MySQL数据库中查找中文短语的长度？

For example, this is my table, which is called example:

--------------------------
| id | en_word | zh_word |
--------------------------
| 1  | Internet| 互联网   |
--------------------------
| 2  | Hello   |   你好   |
--------------------------

and so on...

And I tried using this SQL Query:

SELECT * FROM `example` WHERE LENGTH(`zh_word`) = 3

For some reason, it wouldn't give me three, but would give me a lot of single letter characters.

Why is this? Can this be fixed? I tried this out in PhpMyAdmin.

But when I did it with JavaScript:

"互联网".length == 3; // true

And it seems to work fine. So how come it doesn't work?

you should use CHAR_LENGTH instead of LENGTH

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