Question

I use Visual Basic 6.0 with SQL Server 2005

Here is my code :

Cn.Execute "INSERT INTO schedule (sch_name, st_id, sch_note)
            SELECT '" & txtSchedname.Text & "', st_id, '" & txtNote.Text & "'
            FROM scheduletype
            WHERE st_name = '" & cboSchedtype.Text & "'"

This is an insert into select statement and works fine. Two inputs directly saved into the [schedule] table and one input coming from [scheduletype] table.

But what if there is no matching records for cboSchedtype.Text?

SELECT st_id
FROM scheduletype
WHERE st_name = '" & cboSchedtype.Text & "'"

Here’s I want to do :

I. Make a ‘sub-insert’ for the value of cboSchedtype.Text into the [scheduletype] table only if it doesn’t exist (before the main insert query does its thing)

II. Otherwise continue normally. (My code successfully does this.)

Answer 1

Use this to add a scheduletype if it does not exist.

insert into scheduletype 
select 'TheScheduleType'
where not exists (select st_name 
                  from scheduletype
                  where st_name = 'TheScheduleType')

After you have done that you can use your insert statement against schedule because you know that the row will exist.