How to make a SQL query?

Question

PHP

In the table, some users have a Number field consisting of 4 digits or more, how to execute a query so that to display users who have 4 digits in the Number field?

Answer 1

select * from users where CHAR_LENGTH(Number) = 4;
wonders of google)

Answer 2

www.mysql.ru/docs/gruber
Something like SQL for dummies