轉換失敗時從字符串

Question

轉換數據和/或時間我試圖轉換YYYYMMDD到MM/DD/YY和使用下面的代碼，但沒有奏效：

Convert(Varchar(8),Convert(Datetime,CONVERT(VARCHAR(8),s.birth_date)),101) DOB 

有人能幫助我。

Answer 1

這應該讓你開始：

;WITH CTE AS 
(
    SELECT birth_date As IntDate, 
      LEFT(CAST(birth_date as char(8)), 4) +'-'+ SUBSTRING(CAST(birth_date as char(8)), 5, 2) +'-'+ RIGHT(CAST(birth_date as char(8)), 2) As ISOFormat, 
      SUBSTRING(CAST(birth_date as char(8)), 5, 2) +'/'+ RIGHT(CAST(birth_date as char(8)), 2) +'/'+ LEFT(CAST(birth_date as char(8)), 4) As USFormat 
    FROM YourTable 
    WHERE birth_date > 9999999 -- must have 8 digits 
    AND birth_date < 99991232 -- last supported date is 9999-12-31 
) 

SELECT IntDate, ISOFormat, USFormat 
FROM CTE 
WHERE ISDATE(ISOFormat) = 1