Question

I have a simple table with the columns:

date - DATETIME
name - varchar(50)
text - varchar(200)

How can I get the row containing the oldest date value to delete just before an 11th row is added, so the number of rows is always 10?

Answer 1

Use Triggers

create TRIGGER trigger_name before insert on table_name
FOR EACH ROW
BEGIN
if count > 10 then
delete from table_name
insert into table_name values(id, name , quantity);
END if;
END ;

you can also refer to this link
http://dev.mysql.com/doc/refman/5.0/en/triggers.html