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Kafka命令

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Android internet connectivity check problem
I\'m new to Android development and working on an Android application that requires the phone to be connected to the internet, through either Wifi, EDGE or 3G.
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In SQL, what does Group By mean without Count(*), or Sum(), Max(), avg(), ..., and what are some uses of it?
In SQL, if we use Group By without Count(*) or Sum(), etc, then the result is as follows: mysql>select * from sentGifts;
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