處理無效日期

SQL Server 的時間序列分析

Maham Faisal Khan

Senior Data Science Content Developer

避免錯誤的日期轉換函式

SELECT
    PARSE('01/08/2019' AS DATE USING 'en-us') AS January8US,
    PARSE('01/08/2019' AS DATE USING 'fr-fr') AS August1FR;
GO

結果：

January8US	August1FR
2019-01-08	2019-08-01

SELECT
    PARSE('01/13/2019' AS DATE USING 'en-us') AS January13US,
    PARSE('01/13/2019' AS DATE USING 'fr-fr') AS Smarch1FR;
GO

**Msg 9819, Level 16, State 1, Line 1**

Error converting string value '01/13/2019' into data type date using culture 'fr-fr'.

SELECT
    TRY_PARSE('01/13/2019' AS DATE USING 'en-us') AS January13US,
    TRY_PARSE('01/13/2019' AS DATE USING 'fr-fr') AS Smarch1FR;
GO

January13US	Smarch1FR
2019-01-13	NULL

使用安全方法與不安全方法的成本相當。

`CAST()` 與 `CONVERT()` 的執行速度大致相同。

`PARSE()` 明顯比 `CAST()` 與 `CONVERT()` 慢。

這些是每秒測量值，會線性擴張。

SQL Server 的時間序列分析