Case Sensitivity

May 6, 2007

Hello !

I have two questions:

1) is it possible to make case sensetive researche in SQL-Server?
like : SELECT * FROM mytable WHERE myColumn = "This" [and not "this"]

2) is it possible to make case sensetive unique indexes? Allowing to add "This" and "this" in the same indexed column?

Thanks a lot for any feedback!

Regards,
Fabianus

my favorit hoster is ASPnix : www.aspnix.com !

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Sep 6, 2007

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Jul 7, 2007

Hi I have two questions about case sensitivity;
1. Do most people write their queries with UPPERCASE keywords or is that only for the textbooks. Personally I find it a hassle, My little finger aches because it is always on and off the SHIFT key
2. I noticed that when I did the following query
-----------------------------
use AdventureWorks
go
Select * employee
-----------------------------
I get an 'invalid object' message
But if I use;
--------------------------
use AdventureWorks
go
Select * Employee
--------------------
It works. SO obviously the query is case sensitive.
Did this use to be the case with SQL 2000. I don't seem to remember having to be careful about case.

THANKS

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Abdul
 
 

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Hi,

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N.B.: Using SQL Server 2005.

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May 23, 2007

Hi all,



I have a data mining model that has a binary dependent variable (let's say 'Yes' and 'No'). I noticed that the model is very sensitive to the distribution of the binary dependent variable. I could not come up with an explaination. I know the model is not over/under fits and multicollinearity is not an issue. And I have enough data size to train the model.

I would expect some sensitivity but not to this extend:











Yes % in training data
Yes % in the prediction results


with DT
with LR
with NN

30.0%
6.0%
11.0%
14.0%

35.0%
12.0%
15.0%
24.0%

37.5%
20.0%
23.0%
27.0%

40.0%
28.0%
33.0%
36.0%

50.0%
43.0%
52.0%
61.0%



DT - Decision Trees

LR - Logistic Regression

NN - Neural Networks



And to make things more interesting, although the precision (% of correct 'Yes's ), true positive ratio and false positive ratio is changing; the overall accuracy (and therefore the score in the mining accuracy chart) remains almost same.



If anyone has an idea it would be highly appreciated.



Thanks in advance, Afsin









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Hello:

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Aug 17, 2005

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Nov 5, 2007

I have a view where I'm using a series of conditions within a CASE statement to determine a numeric shipment status for a given row. In addition, I need to bring back the corresponding status text for that shipment status code.

Previously, I had been duplicating the CASE logic for both columns, like so:




Code Block...beginning of SQL view...
shipment_status =
CASE
[logic for condition 1]
THEN 1
WHEN [logic for condition 2]
THEN 2
WHEN [logic for condition 3]
THEN 3
WHEN [logic for condition 4]
THEN 4
ELSE 0
END,
shipment_status_text =
CASE
[logic for condition 1]
THEN 'Condition 1 text'
WHEN [logic for condition 2]
THEN 'Condition 2 text'
WHEN [logic for condition 3]
THEN 'Condition 3 text'
WHEN [logic for condition 4]
THEN 'Condition 4 text'
ELSE 'Error'
END,
...remainder of SQL view...






This works, but the logic for each of the case conditions is rather long. I'd like to move away from this for easier code management, plus I imagine that this isn't the best performance-wise.

This is what I'd like to do:



Code Block
...beginning of SQL view...
shipment_status =
CASE
[logic for condition 1]
THEN 1
WHEN [logic for condition 2]
THEN 2
WHEN [logic for condition 3]
THEN 3
WHEN [logic for condition 4]
THEN 4
ELSE 0
END,


shipment_status_text =

CASE shipment_status

WHEN 1 THEN 'Condition 1 text'

WHEN 2 THEN 'Condition 2 text'

WHEN 3 THEN 'Condition 3 text'

WHEN 4 THEN 'Condition 4 text'

ELSE 'Error'

END,
...remainder of SQL view...


This runs as a query, however all of the rows now should "Error" as the value for shipment_status_text.

Is what I'm trying to do even currently possible in T-SQL? If not, do you have any other suggestions for how I can accomplish the same result?

Thanks,

Jason

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Error -2147217900


Error -2147217900

 

Incorrect syntax near the keyword 'CASE'.
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