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understanding the load_Transform_salescreditcard script


understanding the load_Transform_salescreditcard script

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craig 84462
craig 84462
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Hi there,
I am trying to understand what the update does in this load script. In the above zip file I have created a staging table, loaded the sales credit data into it using an SSIS from the Adventure works database (a sample microsoft sql database). The way I understand is that the load script inserts new records that are NOT in the transform table but ARE in the staging table (ie:hence a right join where t.creditcard is null). However I don't really understand what the update function above is doing. Is it closing off the record by setting dateto=today's date??? but why is there a left join hence. I also can't see anywhere in the final table where the 'update' is working.

thanks Craig
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SQL example.zip (3 views, 12.00 KB)
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