DataSource Controls :: How To Create A Constraint For 3 Columns
Jun 4, 2010
I want to create a constraint for 3 columns (A B and C) where if columns B or C are not null, then A cannot be null. And vice versa (i.e., if A is not null, then either B cannot be null, or C cannot be null).I am not very well versed in SQL and would like to know what is the best way to achieve this (e.,g Check constraint, stored procedure, function, trigger)? I'm leaning towards trigger but I'm not 100% sure if that's right nor of how to implement it.
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Similar Messages:
Oct 19, 2010
I have a SQL Server 2000 table with 7 columns and would like to add a constraint that prevents a row being added with the same value for both Col2 and Col3.
So, for example, if Col2 = 205 and Col3 = 5, then the constraint should prevent inserting another row with the values for Col2 = 205 and Col3 = 5.
The following is an example of what I would like to prevent:
Col1 Col2 Col3 Col4 Col5 Col6
1 205 5 1 1 1
2 205 5 0 0 0
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Jan 6, 2010
Here I have specified a query which gives an idea about how to drop a constraint and recrate it..
[Code]....
Parent_TableName: is the name of the table where we actually reffer.
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Apr 24, 2010
let say i have 2 table (PARENT and STUDENT table)
the structure for both table are
STUDENT
PARENT
student_id (PK) parent_id (PK)
student_parent (FK) parent_status (the value is either ACTIVE OR INACTIVE)
- parent_id is refer by STUDENT table as a foreign key
- now i want to inactive the status for parent
- i want my system pop out a message something like "The parent you want to inactive is refer by a student, inactive is not allow"
- is it any constraint in SQL Server 2005 to help me check whether parent it is refer by student table? The concept i want to use is something like delete constraint in SQL Server 2005 mean it is not allow to delete a person who is refer by a student in STUDENT table.
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May 12, 2010
The DELETE statement conflicted with the REFERENCE constraint "FK_EquipmentStatus_MeetEquip". The conflict occurred in database "D:MEETINGROOMAPAPP_DATADATABASE.MDF", table "dbo.EquipmentStatus", column 'Fk_MeetEquip'.
I'm getting this error when i'm trying to delete a listboxitem. It's true that an other table (EquipmentStatus) is using the primary key attached to the listboxitem, but how can i delete all the rows that causes this problem? I've seen an example using stored procedure, but i dont understand it, since i haven't really worked with it before:
ALTER TABLE t2
DROP CONSTRAINT FK_t1id
ALTER TABLE t2
ADD CONSTRAINT FK_t1id FOREIGN KEY (t1id) REFERENCES t1 (t1id) ON DELETE
CASCADE
My listbox is using MeetEquip table which p-key is MeetEquip.ID, and the fk-key (which generates the problem) is fk_MeetEquip from EquipmentStatus table.
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May 10, 2010
Sql constraint to convert empty string to null
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Apr 27, 2010
I'm new to asp.net and I'm building a project in which I send data to a database MSSQL, I've set a constraintname on some fields that I wantto be unique, now how do I catch that error when people insert a duble and handle it with a redirectionto custom error pagehere the code just in case you need it
Dim con As New System.Data.SqlClient.SqlConnection
con.ConnectionString = "Data Source=localhost;Initial Catalog=Database1;User ID=user;Password=password;TrustServerCertificate=True"
Dim myCommand As New System.Data.SqlClient.SqlCommand
myCommand.CommandText = "INSERT INTO serves(CategoryID,UserId,vote, Img, link, Description) VALUES('" & DropDownList1.SelectedValue & "','" & UId.Text & " ' ,1,'" & TextBox1.Text & "','" & "<a href=" + TextBox2.Text + ">" + TextBox4.Text + "</a>" &
"','" & TextBox3.Text & "')"
myCommand.Connection = con
con.Open()
myCommand.ExecuteNonQuery()
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Sep 20, 2010
I created a gridview that is made up of 4 gridviews and using a stored procedure to populate it. I create columns at runtime because the number of columns changes all the time.To make the grids editable I am adding template fields at runtime as I create the columns, this is to ensure that a user is able to edit the cells and some foot values update. Reason why I have four grids is to freeze rows and columns like in excel using javascript. The problem is that performance is very bad especially in IE, the grids take a long time to load. I am not sure if this is caused by the data load or the creation of text boxes. see some of the code below for my _aspx page:
[Code]....
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Apr 21, 2010
I have two columns first name and last name , that have duplicates, how can i remove the duplicates and only leave the distinct members intact?
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Oct 3, 2010
I"m using table adapters here. I tried to use the following in my table adapter:
ALTER TABLE tblAdvanceLInk
DROP FOREIGN KEY FK_tblAdvanceLink_tblLink
DELETE FROM [tblAdvanceLink] WHERE WebsiteID=@WebsiteID
The DELETE statement conflicted with the REFERENCE constraint "FK_tblAdvanceLink_tblLink". The conflict occurred in database "LinkExchanger", table "dbo.tblAdvanceLink", column 'LinkID'. The statement has been terminated
I get the same problem every time. So I read you could do this in a sql query. Why doesn't this work in my tableadapter? Do I have this in the right place? Do I also put this into the other table? (tblLInk) Isn't there a way to just relax ALL constraints so I can delete some rows? I'm deleting rows from both tables which have the corresponding websiteID
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Oct 6, 2010
I try to create one CONSTRAINT in Sql Server 2008 which checked that:
if Frecuencia = 0 then EsPar <> null
I try to do this:
ALTER TABLE [IngresoxConsorcio] WITH NOCHECK
ADD CONSTRAINT CheckBimestral
CHECK(Frecuencia = 2 AND EsPar <> null)
But obviously don't works
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Jan 27, 2011
I have a datasource, which includes many columns, idealy, I need use a gridview to show:
1) first 3 columns: template fields, these fields depends on values in some columns of datasource. I use template fields, hard coded. works fine.
2) the other columns. This is I do not know how to do it. In the data source, there are about 10-20 columns data, each time, the # of columns of the data varies. idealy, I need show each of them as a seperated column in gridview. The entire data source may have 30 columns, but some of them are used in 1), and I only want show these 10-20 columns in gridview. Some columns in data source, I may not use them at all. is there a way to do this? or have to seperate them as a detail view style UI?
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Sep 2, 2010
<?xml version="1.0" encoding="utf-8" ?>
<mappings root="sound" child="item" delimiter=",">
<mapping pos="0" name="product" type="Element" />
<mapping pos="1" name="partID" type="Attribute" />
<mapping pos="2" name="numberInStock" type="Element" />
<mapping pos="3" name="numberOnOrder" type="Element" />
<mapping pos="4" name="deliveryDate" type="Element" />
<mapping pos="5" name="supplierStreet" type="Element" />
<mapping pos="6" name="supplierCompany" type="Element" />
<mapping pos="7" name="supplierPhone" type="Element" />
<mapping pos="8" name="orderedBy" type="Element" />
</mappings>
this is my xml file
what i need is a table with 9 columns say item,product....orderedBy
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May 7, 2015
How can i create DropDownList which shows multiple columns and only one column selected on selection.
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Mar 18, 2011
Here is the situation:I have a Datagrid which is going to display a number of rows. I want to click a button on the datagrid and have the following occur
open a row underneath the row clicked, without hiding or replacing that row Open this row so that it spans all of the columns as one continuous row where i can put form fields and/or just data formatted as I would like and not just in columns.Be able to close that new row. While I do most of my work in VB.NET, don't think that is a requirement for answering this.I have managed to currently take the first column (with the "Edit" button) and when clicked to
Hide the rest of the cells in that row Expand the button column to run all the way across the table Unfortunately I loose the clicked row's data, and I've only started getting this to work so I haven't tried too much, or getting data to bind to fields "on the fly"
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Jan 21, 2010
I'm trying to add these 4 co,umns to the table as bit type woth a defaut of FALSE. What am I doing wrong here? I get a syntax error near (
create PROCEDURE [dbo].[AddADIFields]
AS
ALTER TABLE dbo.tblTESTS ADD (AI1 Bit 0,AI2 Bit 0,AI3 Bit 0,AI4 Bit 0)
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Mar 3, 2010
I am SELECTING two columns:
SELECT ([FirstName] + [LastName]) AS [FullName], UserID WHERE CustomerID = @CustomerID
I would just like to know if there is a way to add a space between the two columns in the select statement.
This SqlDataSource Binds to a DropDownList so TextValue = "FullName" and DataValue = "UserId"
but of course, the way it is now the fullname is all one word.
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Jul 30, 2010
Iam working on an asp.net application.Recently client come with new requirement. Need a control which is similar to table or like gridview with rows and columns.It should allow user to enter data in the cells. And when the user press tab it should go to next cell and finally if we press enter key, it should validate the data entered in the current row and if data is correct it should create a new empty next row(like entering data manually in an sqlserver table). How can i implement this functionality? Can i use gridview / javascript to implement this functionality.
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Jan 4, 2010
I have a table, that contains a number of rows, in each row there are three columns that are mutually exclusive. What I need is to be able to have radio buttons that are linked across the three columns.
tocid
mandactionid
action
yes
no
notapp
comment
1
1
Action 1
1
0
0
Comment 1
1
2
Action 2
0
1
0
Comment 2
1
3
Action 3
1
0
0
Comment 3
I'd like for where there is a 1 for it to display a checked radio button, and where there is a 0 for it to be unchecked. This can then be edited by clicking the radio in another column where necessary.
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Jun 15, 2010
I want to know that how many tables we can have in database and what is the maximum no. of columns.I also want to know the maximum size for each datatype.
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Apr 27, 2010
I need to join some tables to get the matching records. I often have to ask around to see how certain tables could be joined. Is there any way to query the information schema or some thing else to see what columns/values match in certain tables in order to figure out how tables should be joined.
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May 18, 2010
I have a DataSet that I bind to a GridView control. I want to only show certain columns from the DataSet. Should I do that with my SQL query (that I use to populate my DataSet) or somehow with a DataView?
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Mar 9, 2010
is there a SQL statment i could write that would sum each column and allow me to then access each sum individually
i.e
Dim objCmd As New OleDb.OleDbCommand("SELECT SUM(expression) FROM orderForm WHERE OrderDate=@OrderDate", objConn)
is there anything i can replace expression with such that all the columns in orderForm could be summed and returned as one record
or is there a way to replace expression with something that would allow me to just keep changing the paramater so i could continuously reexectute the same command w/o having to create a new command for each column
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Apr 15, 2010
this is my sample script
[Code]....
after execute this script which returns a column name "XML_F52E2B61-18A1...." can I change this column name?like this
select EMPNO AS EmployeeName -- we can use AS to change column name
from EMPLOYEE
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May 3, 2010
I am returning a dataset from a method and trying to set one of the columns as Primary Key.
CategoryList.Tables[0].PrimaryKey = new DataColumn[] { CategoryList.Tables[0].Columns["CategoryNodeId"] };
Interestingly it gives me this error at run-time, These columns don't currently have unique values.
Now I perfectly know why this error should error, but there are no duplicate keys in this data column. I broke the code in between and bound the dataset to gridview to check if this column contains any duplicates and this is not the case. Here is the result set underneath. Have a look at the first column 'CategoryNodeId'.
CategoryNodeId
CategoryId
Name
ParentCategoryNodeId [code]...
unable to find a work around for now.
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