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Casting DateTime

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Topic

kjamal
Starting Member

1 Post

Posted - 2013-07-16 : 09:32:08

I have a very old database that has configured Date as a numeric value instead of a DateTime value making it really hard to filter. So in my query I'm trying to cast it into a DateTime value but I'm receiving some errors. Is it possible for someone to offer some modifications to my existing query for it to run error free?

My Query:
SELECT
CAST (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]) 'Date',
LEFT(CAST(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]),8) 'Time',
[Object] AS [Dataset],
SUBSTRING(Parms,1,6) AS [Media]
FROM (Select CONVERT(VARCHAR(18),[Date]) [Date],
[Object],
MsgID,
Parms
FROM JnlDataSection
WHERE CAST(substring(convert(varchar(50), [Date]), 0, 5) + '-' +
substring(convert(varchar(50), [Date]), 5, 2) + '-' +
substring(convert(varchar(50), [Date]), 7, 2) AS DATETIME)) =
(Date, DATEADD(day,-1, getdate())) A
Where MsgID = '325' AND
SUBSTRING(Parms,1,6) = 'V40449'
Order By Date DESC;

Msg 4145, Level 15, State 1, Line 21
An expression of non-boolean type specified in a context where a condition is expected, near ')'.

James K
Master Smack Fu Yak Hacker

3873 Posts

Posted - 2013-07-16 : 10:04:34

quote:
Originally posted by kjamal

I have a very old database that has configured Date as a numeric value instead of a DateTime value making it really hard to filter. So in my query I'm trying to cast it into a DateTime value but I'm receiving some errors. Is it possible for someone to offer some modifications to my existing query for it to run error free?

My Query:
SELECT
CAST (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]) 'Date',
LEFT(CAST(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]),8) 'Time',
[Object] AS [Dataset],
SUBSTRING(Parms,1,6) AS [Media]
FROM (Select CONVERT(VARCHAR(18),[Date]) [Date],
[Object],
MsgID,
Parms
FROM JnlDataSection
WHERE CAST(substring(convert(varchar(50), [Date]), 0, 5) + '-' +
substring(convert(varchar(50), [Date]), 5, 2) + '-' +
substring(convert(varchar(50), [Date]), 7, 2) AS DATETIME)) =
(Date, DATEADD(day,-1, getdate())) A
Where MsgID = '325' AND
SUBSTRING(Parms,1,6) = 'V40449'
Order By Date DESC;

Msg 4145, Level 15, State 1, Line 21
An expression of non-boolean type specified in a context where a condition is expected, near ')'.

You have brackets mis-aligned. The following will eliminate the syntax errors, but that doesn't mean the logic is correct, or that this is what you should be using.

If you can post a sample of the numeric representation of the data and what you want it to be converted to, someone will be able to offer a simpler way of doing that conversion:

SELECT 
CAST (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]) 'Date',
LEFT(CAST(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]),8) 'Time',
[Object] AS [Dataset],
SUBSTRING(Parms,1,6) AS [Media]
FROM (
	Select CONVERT(VARCHAR(18),[Date]) [Date], 
		[Object],
		MsgID,
		Parms
		FROM JnlDataSection
	WHERE 
		CAST(substring(convert(varchar(50), [Date]), 0, 5) + '-' +
		substring(convert(varchar(50), [Date]), 5, 2) + '-' +
		substring(convert(varchar(50), [Date]), 7, 2) AS DATETIME) =
		CONVERT(Date, DATEADD(day,-1, getdate()))) A
Where MsgID = '325' AND
SUBSTRING(Parms,1,6) = 'V40449' 
Order By Date DESC;

SwePeso
Patron Saint of Lost Yaks

30421 Posts

Posted - 2013-07-16 : 12:42:33

Please give an example of Date column.

N 56°04'39.26"
E 12°55'05.63"

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