sql - Adding a leading zero to some values in column in MySQL

Question

I have a CSV file sent to me in CSV. The field of interest is 8 digits. Some of those started with a 0. The field was sent numeric. So, I now have dropped some leading zeros.

I already converted the field to varchar. I now need to do this:

I have this now:

12345678
1234567

I need to have this:

12345678
01234567

Answer 1

Change the field back to numeric and use ZEROFILL to keep the zeros

or

use LPAD()

SELECT LPAD('1234567', 8, '0');