MySQL UPDATE append data into column

Question

I need to UPDATE tablename (col1name)

If there is already data, I need to append it with values \'a,b,c\' If it is NULL, I need to add the values \'a,b,c\'

I

Answer 1

Try this Query:

update tablename set col1name = concat(ifnull(col1name,""), 'a,b,c');

Refer this sql fiddle demo.