Data Flow Task Question

Hi there. I'm trying to learn SSIS, please, help me. I have 2 questions:

1)
There are 2 databases on 2 different servers. I need to get data from Table1(database1) and put it to Table2(database2). But I have to insert rows, which ID is not exists in Table2. How Can I do necessary filter?

2)
In the OLE DB DataSource Component I have used SQL Command(it's simplified):

declare @TmpTable TABLE (WorkCode int not null);

INSERT INTO @TmpTable (WorkCode)
select WorkCode
from Table1

SELECT WorkCode
FROM @TmpTable

SSIS Package works without any exception. But there is no any inserted record in destination table. If I try similar query without temporary table - it works good. Why?