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

You can use the following:

update yourtable 
set yourcol = case when yourcol is null then 'a,b,c'
                  else concat(yourcol, ' a,b,c') end

See SQL Fiddle with Demo

Sample data:

CREATE TABLE yourtable(`yourcol` varchar(50));

INSERT INTO yourtable(`yourcol`)
VALUES  ('sadsdh'),
    (NULL);

Will return:

|      YOURCOL |
----------------
| sadsdh a,b,c |
|        a,b,c |