I need to create a new field on a table and have that field default to another field value in that same table. Is there a way to do this w/ a default constraint rather than adding a trigger to the table? If i can't use a default constraint does anyone have a template trigger i could use? Below is an example of what i'm trying to do (Field_C is the new field and i want it to use Field_A value if no other value is specified on insert). Any help would be greatly appreciated.
alter table FOO add Field_C varchar(50) not null constraint FOO_default DEFAULT Field_A
Where can I get some information on field-level encryption in SQL Server? My users will be installing my ASP.NET app on a laptop and taking it out "into the field". If it gets stolen they want some safeguards.I've suggested that they encrypt the hard drive and things, but they want field-level encryption for the data. I know how to do things like hash a password, but that doesn't help with retrieval. I have to be able to search on and decode the data. For example, I have SSN as a field. I need to be able to search on SSN, display it to the user, and allow them to change it.The other problem is partial searches. If I encrypt SSN in the database then I can probably just search on the hashed value, but if I want to search on "smith" and get all of the smiths, smithes, etc., then I can't search on the encrypted value. I have about 1 million records, so decrypting each name to do the search would be prohibitive.Anyway, I'm sure this has been done, so if there is a thread or a site that discusses this I'd be willing to read up on it.
This is the best suited forum I found that fits my problem. If there's a better one, please direct me to it.
I have an Access database that contains (for the purpose of my application) a lot of information (15,000+ records in one of the tables). My application suffers from slow performance because of the size of the tables (this is because the data has to be compared to data on a Palm device). I have done a lot of optimizations to the code, but I haven't found a way to implement the best optimization for my case: Getting row- and field-level modification dates. That way I can only compare relevant data and not the whole database.
For example, I wish there was a way to filter out rows from a table that were modified before January 1st, 2007. Another example: Filter out rows that their Address column was modified in the last two weeks.
I know that a partial solution will be to implement this on my own: adding a Modified column to all my tables. But, as I said, this is only a partial solution because it saves only the row's modification date, and not for each of the fields. Plus, this is a really ugly solution, having this column standing out everywhere.
Is there a chance this is implemented inside Access (or SQL server, for that matter)? The closest I came was finding out that there's a field in msysobjects that specifies when a table was last modified. But not a row or a field in a row.
Any help will be greatly appreciated!
Thanks.
P.S. The weird thing is that this "modified" bit that I'm looking for is implemented on Palm devices and is very easy to use... Seems ironic that there won't be a simple way to do this on a PC.
P.P.S. I guess row- and field-level modification dates are the same... of course, Modified(row) = MAX(Modified(field1), Modified(field2), ...)
(This was previously posted @ http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1935938&SiteID=1&mode=1, I transferred it here because it's more relevant)
I have an Access database that contains (for the purpose of my application) a lot of information (15,000+ records in one of the tables). I use C++ non-.NET ADO in order to access that database (msado15.dll). My application suffers from slow performance because of the size of the tables (this is because the data has to be compared to data on a Palm device). I have done a lot of optimizations to the code, but I haven't found a way to implement the best optimization for my case: Getting row- and field-level modification dates. That way I can only compare relevant data and not the whole database.
For example, I wish there was a way to filter out rows from a table that were modified before January 1st, 2007. Another example: Filter out rows that their Address column was modified in the last two weeks.
I know that a partial solution will be to implement this on my own: adding a Modified column to all my tables. But, as I said, this is only a partial solution because it saves only the row's modification date, and not for each of the fields. Plus, this is a really ugly solution, having this column standing out everywhere.
Is there a chance this is implemented inside Access (or SQL server, for that matter)? The closest I came was finding out that there's a field in msysobjects that specifies when a table was last modified. But not a row or a field in a row.
Any help will be greatly appreciated!
Thanks.
P.S. The weird thing is that this "modified" bit that I'm looking for is implemented on Palm devices and is very easy to use... Seems ironic that there won't be a simple way to do this on a PC.
P.P.S. I guess row- and field-level modification dates are the same... of course, Modified(row) = MAX(Modified(field1), Modified(field2), ...)
Is it possible to change the default value of a field using a stored proc or query? Any hints on how to do this if it is possible would be appreciated!
hi, please help me, i have a data driven site, i made a field that i call "Status"so this is how it should happens, there are three different gridviews in a single page, gridview1 filter is [status] = ok, gridview2 filter is [status] = fine, gridview3 filter is [status] = complete, so all gridview has its own <asp:hyperLinkField> at first the value of "Status" is ok, so it will appear in the gridview1, so when the user click on the <asp:HyperLinkField> of gridview1 it will go to a new page with a form view, this page has a button that when click will change the value of the status field to "fine", so that it will no longer appear to the gridview1 but it will now appear to gridview2 and same with the next <asp:HyperLinkField> click until it appears to the final gridview. so my question is how can i make the button that is capable of changing (update) the value my database field (status) to a specific value, that is not visible to the user thru codebehind or plain asp.net codes. please help me, if you need more info just reply.ThanksSALAMAT PO!
I am doing a shopping basket type demo.I have difficulties going from table with fields like (Name,ProductCode) to table(Name, ProductCode, NumberOfItems). One way could be adding just Name and ProductCode fields and let NumberOfItems come automatically. It could have some common value like 1. How should I do this with VB.
In SQL Server 2000 / Asp.Net I am trying to use default values for all fields; hoping to eliminate nulls.
For number and character fields, the default is pretty obvious, but is there any empty value for a date field? I think a null there might be better than putting in a bogus date, at least it can be tested for.
Are there any more developend ideas on this question?
I am creating a new filed in SQL Server 2005, and I want the field to have the default of '0'
I select the data type as numeric and save my changes, I then visit our front end database to see if the default value is just '0' but it appears as '0.00'
SO i thought about changing the default value to int (im thinking this means integer?) and changing it to '3' but it still displays the decimal point and two 0's
Am I doing something wrong here? I just want it to display '0'
should I set to "0" as a default value on a quantity and a price fieldor set to "null"?if a user enter nothing on the quantity or price field on a webbrowser, should I treat it as null or "0"? I am so confused about thisconcept. please advise me. thank you.
We want to add a default date to our database tables. Looking at other database samples people use all sorts of dates to add as default date e.g. 1/1/1997 or the getdate() function. Is it good practice to set a default date and what should the default date be???? Newbie
I am working with a SQL server 2005 database. I have created several new tables. In one of the tables, I need to set up a data field so that it will default to a particular value. For exampe, I need to have a particular data field default to a value of '0' How can I do this? I would prefer not to do this through Query analyzer. I have been using the interface to SQL server 2005 provided through the Visual Studio IDE. Thanks in advance, Bill
Is there a way to set a field value to the column default in an update statement? Eg. UPDATE Table2 SET field1 = DefaultValue where DefaultValue is the field1 column default in the table definition. The reason I need to do this is when I delete a record from Table1, I need to set the foreign key in Table2 to the default (I don't want to delete the record in Table2, just want to set the key to a default key). I could hard-code the default value in the stored procedure but I think that's just not clean. If I create a new instance of the DB and the default value changes, I'd need to change the stored procedure(s). Just not clean... To avoid a drawn-out discussion, there are reasons why I can't setup a relationship between the two tables and use "ON DELETE SET DEFAULT". Any info greatly appreciated.
hi I have a field call: password, I want to generates some random chars as default password for users (so user got something to login, and update later).
Current Solution I have: I made myself a trigger and it does generate password on insert, but the problem with that is I have to allow NULL on that field. I don't want NULL to be allowed, and if I don't allow null... sql server won't allow me to insert a record (when leaving password field empty).
Reason i don't wanna allow NULL on that field, is because there may be more applicaions using the same field from the same database. Just in case if the other developer gets sloopy, I don't want other application(s) allow user put to enter a null or leave it blank on my password field.
My question is: 1) can I put a function or some sort at the "Default" field under "Design Table", if so...how? 2) any suggestions for a better implementation? 3) if (1) doesn't work, what other options would you suggest other then the current trigger i'm using?
There are two tables, parent and child table.Foreign key field of the child table is not a required field. If thedata is submitted w/o a value into the foreign key field, what shouldI make it as a default value? Should it be "null"?
I have a datatable : Data_Table and a look up table: Lk_table. Myfield that I use in Inner Join is defined in both the data and look table.
So I build my query like this:
SELECT * FROM dbo. Data_Table INNER JOIN
dbo. Lk_table ON dbo.Data_Table.MyField = dbo.Lk_table.Myfield
The pb, sometimes I have myfield still with its default null value in the datatable: Data_Table. So, I end up getting 0 record when I execute the query shown above.
How do I turn that around so that even if myfield in Data_Table is Null, I still get the records from Data_Table. (I don t want a set of records including all possible values from the look up table: Lk_Table)
SELECT ArticleID, ArticleTitle, ArticleDate, Published, PublishDate, PublishEndDateFROM UserArticlesWHERE (ArticleDate >= PublishDate) AND (ArticleDate <= PublishEndDate) When I use the above on a GridView I get nothing. Using SQL manager it works great. I don't know how to pass the value of the ArticleDate field as a default parameter or I think that's what I don't know how to do. I am trying to create a app that I can set the dates an article will appear on a page and then go away depending on the date. Thanks for any help!
I am converting an Access 2003 database into SQL 2005 Express for purposes of evaluating the SQL server environment as a future home for my data. One of the motivating factors in the conversion is the integration of LINQ with VB 2008.
Assuming that there was no conversion tool to migrate Access forms for use with SQL and VB 2008, I converted the Access data table and used the VB 2008 form designer to databind textbox controls to fields in the converted SQL database. Here are some basic questions:
The conversion from Access to SQL apparently did not include the default numeric formatting (currency, percentage, etc.) which was part of the Access data table. Is there a place in the SQL server environment to supply a default data format so that forms and reports referencing the field do not need to be manually formatted for each reference?
After converting the data table and spending 2 hours designing the dataform for the 80+ fields, I inadvertantly changed the table structure and found that the dataform was not happy (oops). I corrected the databindings manually for the few errant field references, but wonder if there is some wizard to do this automatically?
Is there a way to print out the dataform itself? I used the following code snippet in my Access form code-behind and I wonder if there is an equivalent VB 2008 function:
Finally, Access can instantly change from dataform to datasheet presentation screens. Can this be done in VB 2008 with two views simultaneously presenting the same SQL data?
Please excuse my naivete, but in contrast to Access 2003 where program functionality is encapsulated into readily apparent controls, menus, and dialogs, the SQL server environment seems foreign, spartan, and all the words are different. Thanks, -BGood
I'm using DTS to import data from an Access memo field into a SQL Server ntext field. DTS is only importing the first 255 characters of the memo field and truncating the rest.I'd appreciate any insights into what may be causing this problem, and what I can do about it.Thanks in advance for any help!
I need to pass in null/blank value in the date field or declare the field as string and convert date back to string.
I tried the 2nd option but I am having trouble converting the two digits of the recordset (rs_get_msp_info(2), 1, 2))) into a four digit yr. But it will only the yr in two digits. The mfg_start_date is delcared as a string variable
option 1 I will have to declare the mfg_start_date as date but I need to send in a blank value for this variable in the stored procedure. It won't accept a null or blank value.
I am trying to drag data from Informix to Sql Server. When I kick off the package using an OLE DB Source and a SQL Server Destination, I get DT_DBDATE to DT_DBTIMESTAMP errors on two fields from Informix which are date data ....no timestamp part
I tried a couple of things:
Created a view of the Informix table where I cast the date fields as datetime year to fraction(5), which failed.
Altered the view to convert the date fields to char(10) with the hopes that SQL Server would implicitly cast them as datetime but it failed.
Hi ,Have a Visual C++ app that use odbc to access sql server database.Doing a select to get value of binary field and bind a char to thatfield as follows , field in database in binary(16)char lpResourceID[32+1];rc = SQLBindCol(hstmt, 1, SQL_C_CHAR,&lpResourceID,RESOURCE_ID_LEN_PLUS_NULL , &nLen1);and this works fine , however trying to move codebase to UNICODE antested the followingWCHAR lpResourceID[32+1];rc = SQLBindCol(hstmt, 1, SQL_W_CHAR,&lpResourceID,RESOURCE_ID_LEN_PLUS_NULL , &nLen1);but only returns 1/2 the data .Any ideas , thoughts this would work fine , nit sure why loosing dataAll ideas welcome.JOhn
Hi,another problem I have is that have compounded fields in my sql table.Exampleproduct@customerI need a simple function to return "customer", so it should return the valueafter "@", unfortunate "@" will sometimes be character number 6, sometimescharacter number 7 etc.regardsJorgen
I have a very strange situation. I've increased the size of an NVARCHAR field from 8 to 9 in a database table. The format of the data that I enter will either be an 8 character field (123456-8) or a 9 character field (1234567-9). The '-' is critical.
It used to only accept the 8 character version, but after increasing the field size, if I try to insert the 9 character field version, it gets truncated after the '-', as though it's still only allowing 8 characters. But that only occurs when I include the '-' or other such characters like '#'. If I try to insert 1234567a9, it works. The following explains the outcomes:
I need create a field to store tax rate. I need only 2 decimal points. I defined the field as decimal, precision=5 and scale=2. Does it mean that it can hold value from 0.00 to 999.99?
