How to choose lowest number value from varchar record

How can i choose lowest number from this varchar column ?

This is just example. I have table with around 12000 records and i need to choose lowest value from every record. Table is varchar but values inside are numeric as you can see.

When you use postgresql, you can simply do it. I will provide sample code.

select id, min(cast(unnset(string_to_array(ranks, ',')) as integer)) as lowest_value from your_table_name group by id;

The goal of the above code is to remove , in varchar values and convert the value to integer and then choose lowest value of the converted values. I hope it will helps you.