MySQL concatenate columns with commas

1. Table structure:

create table tableName(
  `ID` int(11) NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `name` varchar(20) NOT NULL AUTO_INCREMENT COMMENT 'name',
)

 2. Insert example data:

insert into tableName values(1, 'one');
insert into tableName values(2, 'two');
insert into tableName values(3, '333');
insert into tableName values(4, 'sisi);

 3. sql to connect columns with commas

select
  GROUP_CONCAT(name) as names
from tableName

 4. Results:

one,two,333,sisi