给定一个如下所示的数据集:
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- id - mac - time -
- 1 - aa:bb:cc:dd:ee - 9pm -
- 2 - aa:bb:cc:dd:ee - 9pm -
- 3 - aa:bb:cc:dd:ee - 10pm -
- 4 - aa:11:cc:dd:ee - 10pm -
- 5 - aa:11:cc:dd:ee - 10pm -
- 6 - aa:bb:cc:dd:ee - 11pm -
- 7 - aa:11:cc:dd:ee - 11pm -
- 8 - aa:11:cc:dd:ee - 11pm -
- 9 - 22:11:cc:dd:ee - 12pm -
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什么查询会产生如下输出:
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- time - total - new(2 or more) - passerby(1) - returning(existed previously) -
- 9pm - 1 - 1 - 0 - 0 -
- 10pm - 2 - 1 - 0 - 1 -
- 11pm - 2 - 0 - 0 - 2 -
- 12pm - 1 - 0 - 1 - 0 -
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