由部分組合日期

SQL Server 的時間序列分析

Maham Faisal Khan

Senior Data Science Content Developer

由部分產生日期

DATEFROMPARTS(year, month, day)

TIMEFROMPARTS(hour, minute, second, fraction, precision)

DATETIMEFROMPARTS(year, month, day, hour, minute, second, ms)

DATETIME2FROMPARTS(year, month, day, hour, minute, second, fraction, precision)

SMALLDATETIMEFROMPARTS(year, month, day, hour, minute)

DATETIMEOFFSETFROMPARTS(year, month, day, hour, minute, second, fraction, hour_offset, minute_offset, precision)

日期與時間一起使用

SELECT
    DATETIMEFROMPARTS(1918, 11, 11, 05, 45, 17, 995) AS DT,
    DATETIME2FROMPARTS(1918, 11, 11, 05, 45, 17, 0, 0) AS DT20,
    DATETIME2FROMPARTS(1918, 11, 11, 05, 45, 17, 995, 3) AS DT23,
    DATETIME2FROMPARTS(1918, 11, 11, 05, 45, 17, 9951234, 7) AS DT27;

DT	DT20	DT23	DT27
1918-11-11 05:45:17.997	1918-11-11 05:45:17	1918-11-11 05:45:17.995	1918-11-11 05:45:17.9951234

處理時區位移

SELECT
    DATETIMEOFFSETFROMPARTS(2009, 08, 14, 21, 
        00, 00, 0, 5, 30, 0) AS IST,
    DATETIMEOFFSETFROMPARTS(2009, 08, 14, 21,
        00, 00, 0, 5, 30, 0)
        AT TIME ZONE 'UTC' AS UTC;

IST	UTC
2009-08-14 21:00:00 +05:30	2009-08-14 15:30:00 +00:00

用部分組合時的陷阱

DATEFROMPARTS(1999, 12, NULL)

DATEFROMPARTS(10000, 01, 01)

DATETIME2FROMPARTS(1918, 11, 11, 05, 45, 17, 995, 0)

NULL

無法建構資料型別 date，其中一些引數的值無效。

無法建構資料型別 datetime2，其中一些引數的值無效。

一起來練習吧！

SQL Server 的時間序列分析