use test;
create table tTempData
(
Sn int,
StrValue varchar(10)
);
insert into tTempData (Sn, StrValue) values (1, 'A');
insert into tTempData (Sn, StrValue) values (2, 'B');
insert into tTempData (Sn, StrValue) values (3, 'C');
select GROUP_CONCAT(DISTINCT StrValue) as rtnVal
from tTempData;