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From InfoWorld]
How do you set up SQL queries in your packages? Let's say you have an Execute SQL task and you need to use a large table join to query the source table. There are several ways you can store the queries, and you can even combine some of them. I'll list them here, but I may forget one (or one combination); don't take this as an exclusive list.
The article continues at
http://www.infoworld.com/d/data-management/be-careful-when-following-ssis-best-practices-907