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Ranch Hand
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please who can explain to me the working principle of synchronized query I searched a lot but the notion still blurry especially the join between table of extern request and intern request
 
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I don't understand what you mean by "working principle". So instead, could you post an example of what you're asking about, along with a question related to that example?

(If you think that more than one example would be helpful, then sure, go ahead and post more than one example.)
 
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