Need help with creating trigger using instead of insert.

Question

Hi all,
I am trying to create a trigger that can read the inserted Mail data from table1 and check if the Mail data matches the Mail data from table2. If the Mail data matches the Mail data from table2 it will get the EmpID from table2 and insert it into table1
column EmpID. 
Here are table2 columns:
EmpID (int) Mail(varchar) Mail2(varchar)
101 [email protected] [email protected]
102 [email protected] [email protected]
table1 columns 
EmpID (int)(primary key) Mail(varchar) Mail2(varchar)
If I insert [email protected] into table1 column Mail, I would like it to get the value for the EmpID from table2 before actually inserting the record into table1, by matching the Mail from table1 = Mail from table2.
I am using ASP.Net to insert the records into Mail and Mail2.
How can I achieve that?
I appreciate any help.

Answer 1

There should be two SQL statements in the stored procedure in order to accomplish the task?
Ideally you need to include logic as a part of your insert procedure itself. You should have a standard insert stored procedure which should include this logic and should be used for all inserts.
Also if EmpID field has to have a non NULL value always you may better off creating a foreign key constraint from Table1 to Table2 on EmpID column to enforce the Referential Integrity.
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