從組中選擇具有特定值的行？

Question

從下面的表格可以看出，如果Project.Date組有失敗和成功，我想保留失敗行，但是如果單行（與其他行一樣），那麼不管狀態如何，保留該行。例如，我想保留第一行，放棄第二行，並將其餘的放在下面的表格上。

╔═════════╦══════════╦═════════╗ 
║ PROJECT ║ DATE ║ STATUS ║ 
╠═════════╬══════════╬═════════╣ 
║ HLM  ║ 20130422 ║ Fail ║ 
║ HLM  ║ 20130422 ║ Success ║ 
║ HLM  ║ 20130423 ║ Fail ║ 
║ HLM  ║ 20130424 ║ Success ║ 
║ HLM  ║ 20130425 ║ Fail ║ 
║ HLM  ║ 20130426 ║ Success ║ 
╚═════════╩══════════╩═════════╝ 

Answer 1

WITH records 
AS 
(
    SELECT [Project], [Date], [Status], 
      ROW_NUMBER() OVER (PARTITION BY [Project], [Date] 
           ORDER BY [Status]) rn 
    FROM TableName 
) 
SELECT [Project], [Date], [Status] 
FROM records 
WHERE rn = 1 

• SQLFiddle Demo

輸出

╔═════════╦══════════╦═════════╗ 
║ PROJECT ║ DATE ║ STATUS ║ 
╠═════════╬══════════╬═════════╣ 
║ HLM  ║ 20130422 ║ Fail ║ 
║ HLM  ║ 20130423 ║ Fail ║ 
║ HLM  ║ 20130424 ║ Success ║ 
║ HLM  ║ 20130425 ║ Fail ║ 
║ HLM  ║ 20130426 ║ Success ║ 
╚═════════╩══════════╩═════════╝