Question

您好我正在尝试将间隔分组30分钟到最近的小时。我可以分组30分钟，但我无法进行最近的小时逻辑工作。我附上了一张快照，您可以从中了解我想要的内容。

  select SUBSTRING_INDEX(GROUP_CONCAT(CAST(price AS CHAR) ORDER BY `timestamp`), ',', 1 ) as open,
                    max(price) high,
                    min(price) low,
                    SUBSTRING_INDEX(GROUP_CONCAT(CAST(price AS CHAR) ORDER BY `timestamp` desc), ',', 1 ) as close,
                    coinrace.watch_list.symbol,
                    timestamp
                    from coinrace.watch_quote
                    join coinrace.watch_list on coinrace.watch_list.watch_id = coinrace.watch_quote.watch_id
                    where (`timestamp` between '2015-12-03' and '2015-12-10')
                    and coinrace.watch_quote.serial_number = 1
                    and coinrace.watch_quote.BuyOrSell='buy'
                    and coinrace.watch_list.symbol='MCOEUR'
                    group by  UNIX_TIMESTAMP(timestamp) div (30*60)

Answer 1

也许你不应该只选择timestamp，而是选择你所分组的值（UNIX_TIMESTAMP(timestamp) div 1800），只有你还应该将它转换回可读的日期时间值：

from_unixtime((UNIX_TIMESTAMP(timestamp) div 1800)*1800)

所以查询将是这样的：

  select SUBSTRING_INDEX(GROUP_CONCAT(CAST(price AS CHAR) ORDER BY `timestamp`), ',', 1 ) as open,
                    max(price) high,
                    min(price) low,
                    SUBSTRING_INDEX(GROUP_CONCAT(CAST(price AS CHAR) ORDER BY `timestamp` desc), ',', 1 ) as close,
                    coinrace.watch_list.symbol,
                    from_unixtime((UNIX_TIMESTAMP(timestamp) div 1800)*1800) as timestamp
                    from coinrace.watch_quote
                    join coinrace.watch_list on coinrace.watch_list.watch_id = coinrace.watch_quote.watch_id
                    where (`timestamp` between '2015-12-03' and '2015-12-10')
                    and coinrace.watch_quote.serial_number = 1
                    and coinrace.watch_quote.BuyOrSell='buy'
                    and coinrace.watch_list.symbol='MCOEUR'
                    group by  UNIX_TIMESTAMP(timestamp) div (30*60)

分组到30分钟的间隔到最近的小时

1 个答案: