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PostgreSQL实现按年、月、日、周、时、分、秒的分组统计
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oracle实现按天,周,月,季度,年查询排序方法
oracle按天,周,月,季度,年查询排序天--to_char(t.start_time,'YYYY-MM-DD')周 --to_char(t.start_time,'YYYY'),to_char(