Filter By Encrypted Field Value

May 17, 2006

I have a table which includes an encrypted field. In the following statement...

select cast(decryptBykey(Column2)as varchar(max)) as column2new, column1 from testtable where cast(decryptBykey(Column2) as varchar(max))=@p1

I retrieve the (now decrypted) secure column as well as another column and then filter the results by a parameter on the (now decrypted) secure field.

Furthermore, if I wanted to sort on the encrypted field, I would once again have to call the cast(decryptbykey... function. It seems to me that this kind of statement would perform poorly since I have to call the same function numerous times. Is there a way to call this function once and then reference the resultant field value throughout the rest of the statement?

I assume that this situation is the same if I call any SQL function to alter a field value..not just the decryptbykey function

Thanks,

Al

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And/or Filter Field Not Enabled In The Group Filter Tab

Jan 26, 2006

Howdy,

I have a table that has a group. In this group, I want to filter by 2 different expressions, concatenated with an OR. BUT I can't change the "And/Or" column value for the first entry because it is grayed out. The column will automatically change to an OR value if both my expression column fields are the same (which I don��t want) but if I put any other value in to the expression field of the second row, the "And/Or" field of the first row automatically changes to an AND.

PLEASE! How do I get the And/Or field "ungrayed" so I can change it to what I want?

The 2 filters I and using check the UserID = to the user, and the other is checking a count to get the Top N 1. (So just showing the current user and the top producer)

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I created Encryption by passphrase . The data type of the encrypted field is varbinary(MAX). Now I want to make one Index on this filed. Name of the encrypted colum is ''Encrypted Account Number' " and the name of the table is "S3schema-Test". The value of ''Encrypted Account Number" is unique. I wrote the following T-sql code :-

CREATE CLUSTERED INDEX [IDX_Encrypted Account Number1]

on [S3schema-Test] ([Encrypted Account Number])

But I am getting following errors:-
Column 'Encrypted Account Number' in table 'S3schema-Test' is of a type that is invalid for use as a key column in an index.

Any Idea, how to fix this error?

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Dec 28, 2007

Hi all,

I am trying to add a filter to the data of a chart as following:
Expression: =Fields!Time.Value
Operator: >
I tried to the following for the value:

12/28/2007
2007-12-28
'2007-12-18'
'12/28/2007'
...

I always get an error saying:

"... Cannot compare data for types System.DateTime and System.String. Please check the data type.."

Any tip will be greatly appreciated.

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Mar 26, 2014

I am putting a SELECT statement together where I need to evaluate a results field, to determine how the color indicator will show on a SSRS report. I am running into a problem when I try to filter out any non-numeric values from a varchar field, using a nested CASE statement.

For example, this results field may contain values of '<1', '>=1', '1', '100', '500', '5000', etc. For one type of test, I need a value of 500 or less to be shown as a green indicator in a report, and any value over that would be flagged as a red. Another test might only allow a value of 10 or less before being flagged with a red.

This is why I setup a CASE statement for an IndicatorValue that will pass over to the report to determine the indicator color. Using CASE statements for this is easier to work with, and less taxing on the report server, if done in SQL Server instead of nested SSRS expressions, especially since a variety of tests have different result values that would be flagged as green or red.

I have a separate nested CASE statement that will handle any of the values that contain ">" or "<", so I am using the following to filter those out, and then convert it to an int value, to determine what the indicator value should be. Here is the line of the script that is erring out"

case when (RESULT not like '%<%') or (RESULT not like '%>%') then
CASE WHEN (CONVERT(int, RESULT) between 0 and 500) THEN '2'
ELSE '0'

The message I am getting is: Conversion failed when converting the varchar value '<1' to data type int.

I thought a "not like" statement would not include those values for converting to an int, but that does not seem to be working correctly. I did also try moving the not to show as "not RESULT like", and that did not change the message.

How I can filter out non-numeric values before converting the rest of the varchar field (RESULT) to int, so that it is only converting actual numbers?

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Jan 23, 2006

I need to start encrypting several fields in a database and have been doing some testing with a test database first. I've run into problems when attempting to restore the database on either the same server (but different database) or to a separate server.

First, here's how i created the symmetric key and encrypted data in the original database:

create master key
encryption by password = 'testAppleA3';

create certificate test
with subject = 'test certificate',
EXPIRY_DATE = '1/1/2010';

create symmetric key sk_Test
with algorithm = triple_des
encryption by certificate test;

open symmetric key sk_Test decryption by certificate test;

insert into employees values (101,'Jane Doe',encryptbykey(key_guid('sk_Test'),'$200000'));
insert into employees values(102,'Bob Jones',encryptbykey(key_guid('sk_Test'),'$500000'));

select * from employees
--delete from employees
select id,name,cast(decryptbykey(salary) as varchar(10)) as salary from employees

close all symmetric keys

Next I backup up this test database and restore it to a new database on a different server (same issue if restore to different database but on same server).

Then if i attempt to open the key in the new database and decrypt:

open symmetric key sk_Test decryption by certificate test;

I get the error: An error occurred during decryption.

Ok, well not unexpected, so reading the forums, i try doing the below first in the new database:

ALTER MASTER KEY ADD ENCRYPTION BY SERVICE MASTER KEY

Then I try opening the key again and get the error again:

An error occurred during decryption.

So then it occurs to me, maybe i need to drop and recreate it so i do

drop symmetric key sk_test

then

create symmetric key sk_Test
with algorithm = triple_des
encryption by certificate test;

and then try to open it.

Same error!

So then i decide, let's drop everything, the master key, the certificate and then symmetric key:

drop symmetric key sk_test
drop certificate test
drop master key

Then recreate the master key:

create master key
encryption by password = 'testAppleA3';

Restore the certificate from a backup i had made to a file:

CREATE CERTIFICATE test
FROM FILE = 'c:storedcertsencryptiontestcert'

Recreate the symmetric key again:

create symmetric key sk_Test
with algorithm = triple_des
encryption by certificate test;

And now open the key only to get the error:

Cannot decrypt or encrypt using the specified certificate, either because it has no private key or because the password provided for the private key is incorrect.

So what am I doing wrong here? In this scenario I would appear to have lost all access to decrypt the data in the database despite restoring from a backup which restored the symmetric key and certificate and i obviously know the password for the master key.

I also tried running the command

ALTER MASTER KEY ADD ENCRYPTION BY SERVICE MASTER KEY

again but this does not resolve the issue.

Thx.

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Apr 15, 2008

Hello,

Here is my problem:

I use SQL Server 2005. I have approx. 50 tables in my database and 30 of them have a filed named "CompanyID". Example:
create table A (ID int identity, NAME varchar(100), COMPANYID int)create table A (ID int identity, REF_ID int, FIELD1 varchar(100), FIELD2 varchar(100), COMPANYID int)

Also there are nearly 200 stored procedures that read data from these tables. Example:
create procedure ABCasbegin /* some checks and expressions here ... */ select ... from A inner join B on (A.ID = B.REF_ID) where ... /* ... */end;

All my queries in the Stored procedure does not filter the tables by CompanyID, so they process the entire data.

However, now we have a requirement to separate the data for each company. That means that we have to put a filter by CompanyID to each of those 20 tables in each query where the tables appear.

Firstly, I put the CompanyID in the context so now its value is accessible through the context_info() function. Thus I do not need now to pass it as a parameter to the stored procedures.

However, I don't know what is the easiest and fastest way to filter the tables. Example:

I modified the above mentioned procedure in the following way:
create procedure ABCasbegin /* some checks and expressions here ... */
-- gets the CompanyID from the context: DECLARE @CompanyID int; SELECT @CompanyID = CONVERT(float, CONVERT(varchar(128), context_info()))
select ... from A inner join B on (A.ID = B.REF_ID) where ...
and A.COMPANYID = @CompanyID and B.COMPANYID = @CompanyID /* ... */end;

Now I have the desired filter by CompanyID. However, modifying over 200 stored procedures is rather tedious work and I don't think that this is the best approach. Is there any functionality in SQL Server that can provide the possibility to put an automatic filter to the tables.
For example: when I wrote "SELECT * FROM A", the actual statements to be executed would be "SELECT * FROM A WHERE CompanyID = CONVERT(float, CONVERT(varchar(128), context_info()))".

I was looking for something like "INSTEAD OF SELECT" triggers but I didn't manage to find any answer.

I would very grateful is someone suggests a solution for something like "global table filter" (that will help me make an easy refactoring)?

Thanks in advance.

Best regards,
Beroetz

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Went, however, I execute a SELECT statement for a specific password all passwords are returned.

This is a small sable code:
------------------------------------------------------------------------------------------------
CREATE TABLE dbo.Users
(
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PassWord nvarchar (50) NOT NULL
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GO

INSERT INTO USERS (User_Name, PassWord)
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GO

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GO

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(2 row(s) affected)
-------------------------------------------------------------------------------------------------
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Is it any way to encrypt password and be able to select them?
Is it any other way to encrypt data into the database?

Thank You

Elias

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go

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