11.1 日期和时间数据类型及工具 字符串和datetime的相互转换 11.1 日期和时间数据类型及工具 Python标准库包含用于日期（date）和时间（time）数据的数据类型，而且还有日历方面的功能。我们主要会用到datetime、time以及calendar模块。datetime.datetime（也可以简写为datetime）是用得最多...

COUNT Description Syntax example keywords COUNT Description Syntax COUNT([DISTINCT] expr) Number of rows used to return the required rows example MySQL > select c...

COUNT Description Syntax example keyword COUNT Description Syntax COUNT([DISTINCT] expr) Number of rows used to return the required rows example MySQL > select co...

Sharding Algorithm Background Parameters Auto Sharding Algorithm Modulo Sharding Algorithm Modulo sharding algorithm provided by CosId Hash Modulo Sharding Algorithm Volume Bas...

Datetimes and Timezones Basic Usage Saving Datetimes with Timezones Reading Time Datetimes and Timezones These examples show how to handle Python datetime.datetime objects c...

COUNT Description Syntax example keyword COUNT Description Syntax COUNT([DISTINCT] expr) Number of rows used to return the required rows example MySQL > select...

time_round description Syntax example keywords time_round description Syntax DATETIME TIME_ROUND(DATETIME expr) DATETIME TIME_ROUND(DATETIME expr, INT period) DATETIME...

time_round description Syntax example keywords time_round description Syntax DATETIME TIME_ROUND(DATETIME expr) DATETIME TIME_ROUND(DATETIME expr, INT period) DATETIME...

time_round description Syntax example keyword time_round description Syntax DATETIME TIME_ROUND(DATETIME expr) DATETIME TIME_ROUND(DATETIME expr, INT period) DATETIME ...

datediff Description Syntax example keywords datediff Description Syntax INT DATEDIFF (DATETIME expr1, DATETIME expr2) Calculate expr1 - expr2, the result is accurate to...