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[eight part essay] what is the difference between unrepeatable reading and unreal reading?

2022-07-06 02:07:00 A cat who likes fish cakes

such as , A piece of data in the database , Zhang San =18 year , Once this data is read by the transaction for the first time , Every subsequent reading is Zhang San =18 year , The value of the data is impossible to change , This is it. It can't be read repeatedly . But if Zhang San is found in the next reading =18 The number of years old is missing ( Or other data ), Like an illusion , This is it. Fantasy reading .
It can't be read repeatedly : The value embodied in a certain line .
Fantasy reading : Reflected in the number of rows .

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