When I saw your question, I just want to answer you as soon as possible, yes, I admit at that time I did not even think about performance, so I am not a dba either. :) Although it seems a simple question, as you and abba said, it is more complicated in real life, but I really learn much from it. I really appreciate it. You make rolia IT more like a technical forum, which is the place I am looking for.
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