[多选题]Which two statements about sequences are true? （） You use a CURRVAL pseudo column to look at the current value just generated from a sequence, without affecting the further values to be generated from the sequence. You use a CURRVAL pseudo column to generate a value from a sequence that would be used for a specified database column. You use REUSE clause when creating a sequence to restart the sequence once it generates the maximum value defined for the sequence. 确定

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