sum(rows) as row, \ formatReadableSize(sum(bytes_on_disk)) as used_disk, \ formatReadableSize(sum(data_uncompressed_bytes)) as before_compress, \ formatReadableSize(sum(data_compressed_bytes)) as after_compress, \ round(sum(data_compressed_bytes) / sum(data_uncompressed_bytes) * 100, 0...
toStartOfQuarter(toDate('2021-08-05 12:02:32')) AS startOfQuarter, toStartOfMonth(toDate('2021-08-05 12:02:32')) AS startOfMonth, toMonday(toDate('2021-08-05 12:02:32')) AS toMonday, toStartOfWeek(toDate('2021-08-05 12:02:32')) AS startOfWeek, toStartOfDay(toDate('20...
时间格式化 selecttoDate(now()),formatDateTime(now(),'%Y%m%d')yyyymmdd1,toYYYYMMDD(now())yyyymmdd2,toYYYYMM(now())yyyymm,toYear(now())yyyy,toMonth(now())mm,formatDateTime(now(),'%d')dd image 实现row_number() rowNumberInAllBlocks(),作用是返回此函数处理的所有块内的递增行号 但是返回的...
toDateTime() :将字符时间戳转化为时间戳 代码语言:javascript 复制 selectnow(),toDate(1509836867),toDate('2017-11-05 08:07:47'),toDateTime(1509836867),toDateTime('2017-11-05 08:07:47')SELECTnow(),toDate(1509836867),toDate('2017-11-05 08:07:47'),toDateTime(1509836867),toDateTime('2017...
一、时间戳转换日期 1 function formatDate(datetime) { 2 // 获取年月日时分秒值 slice(-2...
SELECT dateDiff('year',toDate('2022-07-13 14:28:33'),toDate('2023-07-13 14:28:33')) AS time 后面一个时间减去前面一个时间,前面的参数为时间类似: 有: 'year','month','week','day','hour','minute','second'。 ———
concat(cast(toMonday(toDateTime(1665936000,'Asia/Shanghai'))ASString),'**',cast(toMonday(toDateTime(1665936000,'Asia/Shanghai'))+6ASString))AS`周一到周日` ; 结果示例: 参考:https://clickhouse.com/docs/en/sql-reference/functions/date-time-functions/#formatdatetime...
toDate(now()) 2022-07-13 取日期中的日期 yesterday() 2022-07-12 昨天的日期 toQuarter(now()) 3 获取当前日期季度 toDayOfMonth(now()) 13 当前月份的天数 toDayOfYear(now()) 194 日期化为天数 toDayOfWeek(now()) 3 获取星期几 toMonday(now()) 2022-07-11 当前周的第一天 ...
例如,如果主键是 (CounterID, Date) ,则part中的数据首先按 CounterID 排序,然后在每个 CounterID 值内按 Date 排序。在后台,ClickHouse合并(merge) data part以实现更高效的存储,类似于Log-structured merge tree。每个part都有自己的primary索引,以实现高效地扫描和定位数据在parts中的位置。当parts合并时,primary...
This format is less efficient than the Native format, since it is row-based. 在二进制格式中通过行写入数据。行和值顺序被列出,不需要分割符。此格式不如 Native 格式高效,它是基于行的。 Numbers以从小到大的方式被写,确定的长度。例如UInt64花费8字节。DateTime被写UInt32,带有unix时间戳。Date 被写入以...