How can we insert data through triggers

[muzammilahmedkhan]

we have two tables table1 have three cols named (itemid int,itemname text,qty int)
and contain data (1,'pepsi',100)

and we have another table "table2" which have three cols named (orderid int,itemid int,qty int)

i want to create trigger(inserte d) on table2 and when i insert values in table 2 i.e orderid , itemid and qty now suppose i insert qty 2
then the table1 quantity automatically become 98 through trigger.
please help me.



regards
Muzammil.A.Khan

[Saikiran]

we have two tables table1 have three cols named (itemid int,itemname text,qty int)
and contain data (1,'pepsi',100)

and we have another table "table2" which have three cols named (orderid int,itemid int,qty int)

i want to create trigger(inserte d) on table2 and when i insert values in table 2 i.e orderid , itemid and qty now suppose i insert qty 2
then the table1 quantity automatically become 98 through trigger.
please help me.



regards
Muzammil.A.Khan

Solution for the above Query

create table tab1(itemid int,itemname varchar(20) null,qty int)
create table tab2(orderid int,itemid int null,qty int)
----insert into tab1 values(1,'pepsi ',100)

create trigger tr_pepsi_sai
on tab2
for insert
as
begin
update a set a.qty=a.qty-b.qty
from tab1 a,tab2 b
end


select * from tab1

insert into tab2 values(1,1,2)

select * from tab2

By
Saikiran.Akella