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Hi Everyone,
First: what is desired
Most of us probably know this trick for clipping of the time part of a DATETIME value (at least you can find it in an awful lot of places on the internet):
@Date = DATEADD (DD, DATEDIFF (DD, 0, @Date), 0)
It will simply get you a new DATETIME value with the time set at 00:00:00.
If you use any other datepart abbreviation you get the same but with the date or time clipped at whatever you selected.
Example: if you use MI you get your DATETIME clipped at the minute value (i.e: seconds and milliseconds set to 0).
It is very useful but it would be even more useful if it were possible to put this in a function.
Then it would be possible to call "my_f_cliptime (XXX, DateTimeValue)" in which XXX (note the lack of quotes) would be the datepart abbreviation you want to pass to the function for further use within the DATEADD and DATEDIFF operations.
The problem is that DATEADD and DATEDIFF do support datepart abbreviations but you have to include them in your source code directly.
Also: you can't pass those abbreviation as strings because DATEADD and DATEDIFF do not accept them that way.
So here is the question: does anyone know of a way to pass the datepart abbreviations (there does not seem to be a datepart variable type) or, alternatively, a way to convert equivalent strings to datepart abbreviations before passing them to DATEADD and DATEDIFF ?
For the moment I suppose there is'nt but then again you never know.
Bye
PS: I am generally not very curious but if possible I prefer knowing everything
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According to This SO answer[^] there is no way to paramterize this argument, so you're stuck with CASE logic
Something like this would do nicely:
CREATE FUNCTION dbo.FlooredDate
(
@date DATETIME,
@interval VARCHAR(10)
)
RETURNS DATETIME
AS
BEGIN
RETURN CASE @interval
WHEN 'DD' THEN DATEADD (DD, DATEDIFF (DD, 0, @Date), 0)
WHEN 'MI' THEN DATEADD (MI, DATEDIFF (MI, 0, @Date), 0)
END
END
GO
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Too bad, I did not see this particular answer before but it confirms a number of similar others I have seen.
I knew I could do it with a case structure like that but I wanted to do it with less code if it was possible.
It just goes to show that you can easily want it all but getting it all is a lot tougher.
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Turn the kludge into a UDF to hide the bulk code and then you have a nice neat function to call. Especially as this feels like it should be reusable code.
Never underestimate the power of human stupidity
RAH
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errr... thats exactly what my example had.
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Then you sir deserve 5, I was responding to his too much code comment  without actually registering the details of your response otherwise I'd have given credit where it was due!
Never underestimate the power of human stupidity
RAH
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Why, thank you 
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Filip Dossche wrote: but I wanted to do it with less code if it was possible
Just to be clear (it wasn;t explicit from my original post), that I had shown the code for a User Defined Function (UDF), and therefore this code would be written once, and not repeated every time you needed this logic.
Thereafter, the usage would be as simple as
SELECT * FROM Whatever WHERE date>dbo.FloorDate('DD',GetDate())
or perhaps
INSERT INTO somewhere (someInfo,someDate) VALUES ('abc',dbo.FloorDate('DD',GetDate()))
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CREATE FUNCTION [Lib].[DateTruncate] (@Subject DateTime , @Granularity varchar(4))
RETURNS DateTime AS
BEGIN
DECLARE @DW int
DECLARE @DF int
SET @DW = DatePart(dw,@Subject) - 1
IF @Granularity = 'YY'
BEGIN
SET @Subject = dateadd(mm,-datepart(mm,@Subject)+1,@Subject)
SET @Granularity = 'MM'
END
IF @Granularity = 'MM'
BEGIN
SET @Subject = dateadd(dd,-datepart(dd,@Subject)+1,@Subject)
SET @Granularity = 'DD'
END
IF @Granularity = 'SU'
BEGIN
SET @DF = 7-@DW
IF @DF >= 0 SET @DF = @DF-7
SET @Subject = dateadd(dw,@DF,@Subject)
SET @Granularity = 'DD'
END
IF @Granularity = 'MO'
BEGIN
SET @DF = 1-@DW
IF @DF >= 0 SET @DF = @DF-7
SET @Subject = dateadd(dw,@DF,@Subject)
SET @Granularity = 'DD'
END
IF @Granularity = 'TU'
BEGIN
SET @DF = 2-@DW
IF @DF >= 0 SET @DF = @DF-7
SET @Subject = dateadd(dw,@DF,@Subject)
SET @Granularity = 'DD'
END
IF @Granularity = 'WE'
BEGIN
SET @DF = 3-@DW
IF @DF >= 0 SET @DF = @DF-7
SET @Subject = dateadd(dw,@DF,@Subject)
SET @Granularity = 'DD'
END
IF @Granularity = 'TH'
BEGIN
SET @DF = 4-@DW
IF @DF >= 0 SET @DF = @DF-7
SET @Subject = dateadd(dw,@DF,@Subject)
SET @Granularity = 'DD'
END
IF @Granularity = 'FR'
BEGIN
SET @DF = 5-@DW
IF @DF >= 0 SET @DF = @DF-7
SET @Subject = dateadd(dw,@DF,@Subject)
SET @Granularity = 'DD'
END
IF @Granularity = 'SA'
BEGIN
SET @DF = 6-@DW
IF @DF >= 0 SET @DF = @DF-7
SET @Subject = dateadd(dw,@DF,@Subject)
SET @Granularity = 'DD'
END
IF @Granularity = 'DD'
BEGIN
SET @Subject = dateadd(hh,-datepart(hh,@Subject),@Subject)
SET @Granularity = 'HH'
END
IF @Granularity = 'HH'
BEGIN
SET @Subject = dateadd(mi,-datepart(mi,@Subject),@Subject)
SET @Granularity = 'MI'
END
IF @Granularity = 'MI'
BEGIN
SET @Subject = dateadd(ss,-datepart(ss,@Subject),@Subject)
SET @Granularity = 'SS'
END
IF @Granularity = 'SS'
BEGIN
SET @Subject = dateadd(ms,-datepart(ms,@Subject),@Subject)
END
RETURN @Subject
END
(Hmmm... I thought it did half-hours and quarter-hours too. That must be in the C# version.)
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The OP was looking for less code. 
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I don't know that language.
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You can pass in with a text literal and then use dynamic SQL to invoke it.
Probably less performant, perhaps less safe, but with less code.
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Hi
Is it possible to use one table more than once when creating a SQL VIEW? For example, the tables I`m using store data about houses and it's features (e.g. bathrooms, bedrooms, etc), and what I want to accomplish is to display the number of bathrooms as well as the number of bedrooms in one view. To do this I`m using the COUNT function to count the number of FeatureId's where the FeatureName = 'Bathroom' etc. as shown below:
SELECT DISTINCT dbo.Mandate.Id, COUNT(BedroomFeature.FeatureId) AS Bedrooms, dbo.MandateType.MandateType, dbo.Mandate.ErfSize
FROM dbo.Mandate INNER JOIN
dbo.MandateType ON dbo.Mandate.MandateTypeId = dbo.MandateType.Id LEFT OUTER JOIN
dbo.MandateListing ON dbo.Mandate.Id = dbo.MandateListing.MandateId LEFT OUTER JOIN
dbo.MandateFeature AS BedroomFeature ON dbo.Mandate.Id = BedroomFeature.MandateId AND BedroomFeature.FeatureId =
(SELECT Id
FROM dbo.Feature AS Feature_1
WHERE (Feature = 'Bedroom')) LEFT OUTER JOIN
dbo.Feature ON BedroomFeature.FeatureId = dbo.Feature.Id
GROUP BY dbo.Mandate.Id, dbo.MandateType.MandateType, dbo.Mandate.ErfSize
This displays perfectly with the number of bedrooms. How can I show an extra column for the number of bathrooms? I tried adding the features table again and giving it a different alias, but somehow that didn't give me the desired results
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One method i can think of is using a store procedure to get your count separately.
Or a sub query in the select parameter.
But either ways aren't really efficient ways.
P.S. first time answering questions here. Hoped I helped
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Could you give a bit more detail on the structure of the database, as it seems to me this is a really difficult way to find out the number of bathrooms and bedrooms for a particular house, especially for a database that profiles houses.
...and I have extensive experience writing computer code, including OIC, BTW, BRB, IMHO, LMAO, ROFL, TTYL.....
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I have a MandateFeature table that contains two Id's , MandateId and FeatureId. Each of these are foreign keys from two different tables (Feature and Mandate). If a mandate (house) contains 3 bedrooms and the Id for bedroom is 5, then the entries in the MandateFeature table will look something like this:
MandateId | FeatureId
----------------------
2, 5
2, 5
2, 5
If a mandate (house) has 2 bathrooms and the Id for bathroom is 6, then the table would look something like this:
MandateId | FeatureId
----------------------
2, 5
2, 5
2, 5
2, 6
2, 6
What I want to do, is to count the number of bedrooms as well as the number of bathrooms and then display it as follows:
Bedrooms: 3
Bathroom: 2
So I get it working using this:
SELECT DISTINCT dbo.__Mandate.Id, COUNT(BedroomFeature.FeatureId) AS Bedrooms, dbo.__MandateType.MandateType, dbo.__Mandate.ErfSize
FROM dbo.__Mandate INNER JOIN
dbo.__MandateType ON dbo.__Mandate.MandateTypeId = dbo.__MandateType.Id LEFT OUTER JOIN
dbo.__MandateListing ON dbo.__Mandate.Id = dbo.__MandateListing.MandateId LEFT OUTER JOIN
dbo.__MandateFeature AS BedroomFeature ON dbo.__Mandate.Id = BedroomFeature.MandateId AND BedroomFeature.FeatureId =
(SELECT Id
FROM dbo.__Feature AS __Feature_1
WHERE (Feature = 'Bedroom')) LEFT OUTER JOIN
dbo.__Feature ON BedroomFeature.FeatureId = dbo.__Feature.Id
GROUP BY dbo.__Mandate.Id, dbo.__MandateType.MandateType, dbo.__Mandate.ErfSize
..but this of course only displays the number of bedrooms. As soon as I duplicate this part:
LEFT OUTER JOIN
dbo.__MandateFeature AS BedroomFeature ON dbo.__Mandate.Id = BedroomFeature.MandateId AND BedroomFeature.FeatureId =
(SELECT Id
FROM dbo.__Feature AS __Feature_1
WHERE (Feature = 'Bedroom')) LEFT OUTER JOIN
dbo.__Feature ON BedroomFeature.FeatureId = dbo.__Feature.Id
and modify it to this:
LEFT OUTER JOIN
dbo.__MandateFeature AS BathroomFeature ON dbo.__Mandate.Id = BathroomFeature.MandateId AND BathroomFeature.FeatureId =
(SELECT Id
FROM dbo.__Feature AS __Feature_2
WHERE (Feature = 'Bathroom')) LEFT OUTER JOIN
dbo.__Feature AS __Feature_2 ON BathroomFeature.FeatureId = dbo.__Feature.Id
..and add COUNT(BathroomFeature.FeatureId) AS Bathrooms to the SELECT, it displays the bedrooms and bathrooms, but the values are duplicated across these 2 columns (and it's not the correct values either)
modified on Wednesday, April 20, 2011 5:49 AM
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Move your sub query from the join to the select and add the mandateID to the where clause. This can be repeated for different feature types.
Caveat this type of sub select can be very slow and expensive.
Another way would be to left join out to the feature table multiple times (1 for each feature type) using a case statement on the if field (case featureid when is null then 0 else 1 end), group by your mandate fields and sum each feature field.
Another way is to use the same multiple joins and then pivot the rows so each feature is in it's own column.
Never underestimate the power of human stupidity
RAH
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SELECT ID, PRODUCT, PRICE, QTY, PRICE*QTY AS TOTAL FROM PRODUCTS
I added the expression PRICE*QTY in the adapter select statement in the design time, now the values can't be updated when running the bound datagridview ie. loads but doesn't save changes.
Please help.
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Not really a surprise: if you were to edit TOTAL (so it no longer equals PRICE*QTY), what should the database do???
I would start by making the TOTAL column read-only. Not sure that will be sufficient though.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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Thanks Luc,
Of course I'm not editing the totals and they're set to read only, I just need the user to see it as the values are entered.. The funny thing is that, I've done it before and I just don't seem to remember how..
Thanks mate!
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Mate you need to look into a proper data access layer. You are using the built in adaptors and running up against their limitations. The reason I didn't follow up on the last problem was I don't know, I and all good developers use and understand the DAL.
It's a learning thing but you obviously need to move to the next stage and get to know how your data is delivered, get to know stored procedures as well.
Never underestimate the power of human stupidity
RAH
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Thanks Holmes, you're absolutely right, actually, I never used the designer when it comes to database programming and this's exactly why I'm asking now.. Guess I'll just have to forget about the designer.. I thought if it will make my life easier, why not to go for it.
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I kicked off a Delete where value > 2 statement. I didn't expect it take take more than a couple of minutes, which has been the case for similar deletes on similar tables. But, it has been executing for 34 minutes, and when I run this statement, the status is suspended.
SELECT start_time, status, command FROM sys.dm_exec_requests
Any ideas as to how to check if or why the initial query is suspended or seemingly not running anymore.
Edit:
Using SQL '05, have seen some answers that suggest upgrading the SP2, but that is not an option right now.
Could this be related to lack of space on the drive where the tempdb and masterdb are stored and the OS is running?
Craigslist Troll: litaly@comcast.net
"I have a theory that the truth is never told during the nine-to-five hours. "
— Hunter S. Thompson
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Ok, it is a pageiolatch issue, lack of disk space.
Craigslist Troll: litaly@comcast.net
"I have a theory that the truth is never told during the nine-to-five hours. "
— Hunter S. Thompson
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Only a computer programmer would make a delete operation fail because there is not enough space. 
Chris Meech
I am Canadian. [heard in a local bar]
In theory there is no difference between theory and practice. In practice there is. [Yogi Berra]
posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]
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