c# - SQL check if value exists and return primary key -


i have 2 tables, customer , application, both have primary keys (customerid , applicationid), application has foreign key of customerid.

when user starts application adds customerid application table other information.

what want write sql query/stored procedure first checks if customerid in application table , if don't add again, update information , return applicationid me use.

then if not in table, add customer id , information , return me applicationid.

my code add database is.

insert application (customerid, q5, q11a)  values (@customerid,@q5, @q11a);" + "select scope_identity()";  int applicationid = convert.toint32(command.executescalar());

how go turning want do?

you can use merge statement in order perform insert or update operation. after can use select statement in order applicationid. query this:

merge application target     using (select @customerid,@q5, @q11a) source (customerid, q5, q11a)     on (target.customerid = source.customerid)     when matched          update set q5 = source.q5, q11a = source.q11a     when not matched            insert (customerid, q5, q11a) values (source.customerid, source.q5, source.q11a ); select applicationid application customerid = @customerid;

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