Question

I am trying to create an update trigger in MySQL Community Server 5.5.16. I have two tables:

create table sales
    (ono integer primary key,
     dnr integer not null,
     osum integer);

create table salessum
    (dnr integer primary key,
     dsum integer);



alter table sales
    add constraint fk_sales_salessum foreign key (dnr) 
            references salessum (dnr); 

I need to update table “salessum” after any update in table “sales”. I have created trigger:

Create trigger up_to_date
after update on sales
for each row
begin
update salessum
set dsum = dsum + new.osum;
where dnr=new.dnr;
end; 

But I’ve got an error:

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near 'where
 dnr=new.dnr' at line 1

Could anyone help me. Thanks.

Answer 1

You have an extra ; in your trigger and since the trigger contains semicolons, you need to change the delimiter temporarily to add the trigger;

delimiter //

Create trigger up_to_date
after update on sales
for each row
begin
update salessum
set dsum = dsum + new.osum
where dnr=new.dnr;
end//

delimiter ;