Question

从下表中，如果Project.Date组有一个失败和成功，我想保留失败行，但如果是单行（如其余的那样），那么无论状态如何，都要保留该行。例如，我想保留第一行，丢弃第二行，并将其余部分保留在下面的表格中。

╔═════════╦══════════╦═════════╗
║ 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

输出

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

从组中选择具有特定值的行？

1 个答案: