Truncate Impala：内置函数trunc（）的返回日

当我使用trunc（timestamp'D'）时，它总是给我该周的星期一。是否可以要求函数返回一周中的其他日期，例如星期二？谢谢

您应该使用

trunc（时间戳'J'）

。请参阅文档了解日期，您使用的是“一周的开始日期”：

trunc(timestamp, string unit)
Purpose: Strips off fields from a TIMESTAMP value.
Unit argument: The unit argument value is case-sensitive. This argument string can be one of:
SYYYY, YYYY, YEAR, SYEAR, YYY, YY, Y: Year.
Q: Quarter.
MONTH, MON, MM, RM: Month.
WW, W: Same day of the week as the first day of the month.
DDD, DD, J: Day.
DAY, DY, D: Starting day of the week. (Not necessarily the current day.)
HH, HH12, HH24: Hour. A TIMESTAMP value truncated to the hour is always represented in 24-hour notation, even for the HH12 argument string.
MI: Minute.

简单，试试看 选择TRUNC（时间戳'D'）+间隔1天