MySQL - Fetch rows where a field value is less than 5 chars

For MySQL you would use the LENGTH() function ie.

select * from users where length(zip_code) < 5

Refer to the docs at http://dev.mysql.com/doc/refman/5.1/en/string-functions.html#function_length for more information.

CHAR_LENGTH(zip_code) < 5

You can use length

SELECT * FROM table WHERE LENGTH(myfield) < 5; 

Check this out for more info.

If you are searching for bad zip codes then char_length(zip_code) < 5 is a start, but it will still pass invalid ZIP codes.

use SELECT * from users where char_length(zip_code) < 5 OR zip_code NOT REGEXP '^([0-9]{5})$'

The regexp part basically searches for zip_codes where the first 5 characters are not numbers between 0-9

Have Fun

You can do

SELECT * FROM table WHERE LENGTH(zip) <= 5;