我有一个复杂的查询，它将日期和时间变量从数值转换为更友好的用户输出。我有第二个SQL查询，它是两个表之间的简单连接。我正在尝试将这两个SQL查询合并为一个，我可以更有效地访问所有信息。
这是我的第一个问题：
Select * from Media
join (SELECT convert(date,
DATEADD(HOUR,-4,CONVERT(DATETIME,LEFT([Date],8)+' '+
SUBSTRING([Date],10,2)+':'+
SUBSTRING([Date],12,2)+':'+
SUBSTRING([Date],14,2)+'.'+
SUBSTRING([Date],15,3)))) [Date],
convert(varchar(8), convert(time,
DATEADD(HOUR,-4,CONVERT(DATETIME,LEFT([Date],8)+' '+
SUBSTRING([Date],10,2)+':'+
SUBSTRING([Date],12,2)+':'+
SUBSTRING([Date],14,2)+'.'+
SUBSTRING([Date],15,3))))) [Time],
[Object] AS [Dataset],
SUBSTRING(Parms,1,6) AS [Media]
FROM (Select CONVERT(VARCHAR(18),[Date]) [Date],
[Object],
MsgId,
Parms
FROM JnlDataSection) A
Where MsgID = '325' AND
SUBSTRING(Parms,1,6) like 'V754%') b on Media.SerialNum = b.Media order by Date Desc, Time Desc
这是我的第二个问题：
SELECT SerialNum, m.MediaId, n.Note as Note
from Media m join Note n on (m.NoteId = n.NoteId)
where SerialNum like 'V754%';
我尝试过：
Select * m.MediaId, n.Note as Note from Media m join Note n on (m.NoteId = n.NoteId)
join (SELECT convert(date,
DATEADD(HOUR,-4,CONVERT(DATETIME,LEFT([Date],8)+' '+
SUBSTRING([Date],10,2)+':'+
SUBSTRING([Date],12,2)+':'+
SUBSTRING([Date],14,2)+'.'+
SUBSTRING([Date],15,3)))) [Date],
convert(varchar(8), convert(time,
DATEADD(HOUR,-4,CONVERT(DATETIME,LEFT([Date],8)+' '+
SUBSTRING([Date],10,2)+':'+
SUBSTRING([Date],12,2)+':'+
SUBSTRING([Date],14,2)+'.'+
SUBSTRING([Date],15,3))))) [Time],
[Object] AS [Dataset],
SUBSTRING(Parms,1,6) AS [Media]
FROM (Select CONVERT(VARCHAR(18),[Date]) [Date],
[Object],
MsgId,
Parms
FROM JnlDataSection) A
Where MsgID = '325' AND
SUBSTRING(Parms,1,6) like 'V754%') b on Media.SerialNum = b.Media order by Date Desc, Time Desc
但是这给了我这个错误：
Msg 102，Level 15，State 1，Line 1
'm'附近的语法不正确。
Msg 102，Level 15，State 1，Line 22
'b'附近的语法不正确。
请注意我正在使用SQL Server 2008 Management Studio。此外，我对更改查询的任何列或数据操作不感兴趣，因为它已经恰当地满足了我的需求。我只是在寻找一个在SQL中运行无错误的组合查询。
答案 0 :(得分：1)
在代码'你试过'，语法错误...尝试下面的代码，我只修复了错误。
SELECT m.MediaId,
n.Note AS Note
FROM Media AS m
INNER JOIN
Note AS n
ON (m.NoteId = n.NoteId)
INNER JOIN
(SELECT CONVERT (DATE, DATEADD(HOUR, -4, CONVERT (DATETIME, LEFT([Date], 8) + ' ' + SUBSTRING([Date], 10, 2) + ':' + SUBSTRING([Date], 12, 2) + ':' + SUBSTRING([Date], 14, 2) + '.' + SUBSTRING([Date], 15, 3)))) AS [Date],
CONVERT (VARCHAR (8), CONVERT (TIME, DATEADD(HOUR, -4, CONVERT (DATETIME, LEFT([Date], 8) + ' ' + SUBSTRING([Date], 10, 2) + ':' + SUBSTRING([Date], 12, 2) + ':' + SUBSTRING([Date], 14, 2) + '.' + SUBSTRING([Date], 15, 3))))) AS [Time],
[Object] AS [Dataset],
SUBSTRING(Parms, 1, 6) AS [Media]
FROM (SELECT CONVERT (VARCHAR (18), [Date]) AS [Date],
[Object],
MsgId,
Parms
FROM JnlDataSection) AS A
WHERE MsgID = '325'
AND SUBSTRING(Parms, 1, 6) LIKE 'V754%') AS b
ON m.SerialNum = b.Media
ORDER BY Date DESC, Time DESC;
使用前两个查询的联盟......
SELECT Media.SerialNum ,
Media.MediaId ,
'Note' AS Notes
FROM Media
JOIN ( SELECT CONVERT(DATE, DATEADD(HOUR, -4,
CONVERT(DATETIME, LEFT([Date], 8)
+ ' ' + SUBSTRING([Date], 10, 2)
+ ':' + SUBSTRING([Date], 12, 2)
+ ':' + SUBSTRING([Date], 14, 2)
+ '.' + SUBSTRING([Date], 15, 3)))) [Date] ,
CONVERT(VARCHAR(8), CONVERT(TIME, DATEADD(HOUR, -4,
CONVERT(DATETIME, LEFT([Date],
8) + ' '
+ SUBSTRING([Date],
10, 2) + ':'
+ SUBSTRING([Date],
12, 2) + ':'
+ SUBSTRING([Date],
14, 2) + '.'
+ SUBSTRING([Date],
15, 3))))) [Time] ,
[Object] AS [Dataset] ,
SUBSTRING(Parms, 1, 6) AS [Media]
FROM ( SELECT CONVERT(VARCHAR(18), [Date]) [Date] ,
[Object] ,
MsgId ,
Parms
FROM JnlDataSection
) A
WHERE MsgID = '325'
AND SUBSTRING(Parms, 1, 6) LIKE 'V754%'
) b ON m.SerialNum = b.Media
UNION
SELECT SerialNum ,
m.MediaId ,
n.Note AS Notes
FROM Media m
JOIN Note n ON ( m.NoteId = n.NoteId )
WHERE SerialNum LIKE 'V754%'
但是，我不知道第一个查询中的数据类型Note是什么？
答案 1 :(得分：0)
至少你在前几行有一个错误： 你有这个：选择* m.MediaId，n。注意注意 但是你需要这个：选择m.MediaId，n。注意注意，*
答案 2 :(得分：0)