Question

我无法确定如何根据另一个表中的值替换存储过程结果的值。我有一个表格[LOG]格式如下：

TIME STAMP, TAG, DESCRIPTION, EVENTCODE, SUBEVENTCODE
30-Aug-2013 10:14:10, TAG X, HI TEMP FAULT, 3, 16 
30-Aug-2013 10:12:10, TAG Y, HI PRESS FAULT, 3, 16
...

另一个表[EVENTS]基本上描述了EVENTCODE的内容：

EVENT, DESCRIPTION 
1, FAULT
2, LOGIC
3, ALARM

我希望存储过程检索第一个表的2000个条目（行），而不是将EVENTCODE显示为数字，而是显示结果中第二个表中包含的描述。 e.g：

TIME STAMP, TAG, DESCRIPTION, EVENTCODE, SUBEVENTCODE
30-Aug-2013 10:14:10, TAG X, HI TEMP FAULT, ALARM, 16

原因是我有另一个与存储过程的结果交互的软件，并且不想创建另一个表来在数据库中保存这些结果。

以下是目前存储过程的样子：

SET QUOTED_IDENTIFIER ON
GO

CREATE PROCEDURE [dbo].[Get2kEvents]
AS
BEGIN

SELECT TOP 2000 CAST(datepart(day,TIME_STAMP) as char(2)) + '-' + 
CAST(datename(month,TIME_STAMP) as char(3)) + '-' + 
CAST(datepart(year,TIME_STAMP) as char(4))+ ' ' + CONVERT(varchar,TIME_STAMP,108)
as 'TIME STAMP', 
[TAG], 
[DESCRIPTION],
[EVENTCODE], 
[SUBEVENTCODE]
FROM [Arc_DB].[dbo].[LOG]
ORDER BY TIME_STAMP DESC

END
GO

感谢您的协助。很抱歉，如果这太基础了，但我在浏览本网站和其他网站时无法找到解决方案。

干杯。

TM

Answer 1

您希望join这两个表格。即：

SELECT TOP 2000 CAST(datepart(day,TIME_STAMP) as char(2)) + '-' + 
CAST(datename(month,TIME_STAMP) as char(3)) + '-' + 
CAST(datepart(year,TIME_STAMP) as char(4))+ ' ' + CONVERT(varchar,TIME_STAMP,108)
as 'TIME STAMP', 
[TAG], 
[DESCRIPTION],
Events.Description, 
[SUBEVENTCODE]
FROM [Arc_DB].[dbo].[LOG]
     inner join events on log.eventcode = events.event
ORDER BY TIME_STAMP DESC

Answer 2

使用JOIN：

SELECT TOP 2000 CAST(datepart(day,TIME_STAMP) as char(2)) + '-' + 
CAST(datename(month,TIME_STAMP) as char(3)) + '-' + 
CAST(datepart(year,TIME_STAMP) as char(4))+ ' ' + CONVERT(varchar,TIME_STAMP,108)
as 'TIME STAMP', 
[TAG], 
L.[DESCRIPTION],

E.[DESCRIPTION], 

[SUBEVENTCODE]
FROM [Arc_DB].[dbo].[LOG] L
INNER JOIN [Arc_DB].[dbo].[EVENTS] E ON E.EVENT = L.EVENTCODE
ORDER BY TIME_STAMP DESC

Answer 3

我会使用左连接并检查缺少的代码：

SELECT TOP 2000 CAST(datepart(day,TIME_STAMP) as char(2)) + '-' + 
CAST(datename(month,TIME_STAMP) as char(3)) + '-' + 
CAST(datepart(year,TIME_STAMP) as char(4))+ ' ' + CONVERT(varchar,TIME_STAMP,108)
as 'TIME STAMP', 
[TAG], 
[DESCRIPTION],
CASE WHEN EVENTS.DESCRIPTION IS NULL
     THEN 'UNKNOWN CODE '+CAST(LOG.EVENTCODE AS VARCHAR(20)) 
     ELSE EVENTS.DESCRIPTION
END AS [Event Type],
[EVENTCODE], 
[SUBEVENTCODE]
FROM LOG
LEFT JOIN EVENTS ON EVENTS.EVENT= LOG.EVENTCODE

ORDER BY TIME_STAMP DESC

SQL存储过程 - 使用现有表列中的值替换结果列

3 个答案: