Know If The Table Column Is Unique?
Mar 15, 2012
currently, what i want to do is, add a column in a table "default" during runtime. Well, I've got that covered already.
The problem is, the column names are actually taken from the users input through a textbox or drop down list and of course, if the same column is added already in the table, it generates an error since it has to be unique.
That is why i wonder if it is possible to know if a column already exists without viewing the form which contains the grid view of that table?
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May 21, 2011
Is there a quick way to put unique value to column in a table? Assuming I want numeric values starting from 0.
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Jul 15, 2010
For each loop through a DataSet, I need to store the values of 2 columns (we'll call them ColumnA and ColumnB) so that I can use them to search the same DataSet again later.The DataSet stores the results of a search and places the value of ColumnA into a ListBox as a new item.When the user clicks on this ListBox item, the application will loop through the DataSet again using the value of ColumnA and the value of ColumnB as criteria to identify the correct row in the DataSet to return.This would be a lot simpler if the value for ColumnA was unique every time, but a value will inevitably be repeated on occasion. That's where ColumnB comes in. This column's value is likely to be unique 90% of the time, and, given the nature of the information in the DataSet, if either column duplicates, the other won't.So I've thought of adding the values for ColumnA and ColumnB into a 2 dimensional dynamic array, but I'm doing something wrong apparently.[code]
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Nov 25, 2010
I have a matrix which is in a text file.
ABMS101848 T G
ABMS101848 C H
ABMS101848 A S
SDFR236176 D Q
SDFR236176 2 X
[Code]...
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Mar 31, 2009
Alright, I have this Access Database. It has 6 Columns: ID | Class Name | Class Code | Class Room | Grade | Teacher
My ID is the Unique Column that I need to reference back too when Updating my other Fields so I get the correct field.How do I do this? Properly.I've been thinking of a method but I doubt it would work.First I would start off selecting all the ID's and then LOOP through all of them, and then rewrite them to to + 1 Each time I make a Delete, so Each Time it will be a consistent 1 2 3 4 5 6 7 8 9 10 .... etc... Then I can reference from that to my Combo Box Selected Index + 1 to get the Correct Row which corresponds with the Selected Item.Will this work? Or will I still need a Unique Fields that I reference back too.
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Jun 19, 2010
i need to get only unique value of a column of a datagridview es:
COMLUMN
value1
value2
value3
[code]....
and get only:
value1, value2, value3, value4
how i can do this?? is possibile make a quaery into datagridview?
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Oct 1, 2009
I have this Access Database. It has 6 Columns: ID | Class Name | Class Code | Class Room | Grade | Teacher My ID is the Unique Column that I need to reference back too when Updating my other Fields so I get the correct field. How do I do this? Properly.
I've been thinking of a method but I doubt it would work. First I would start off selecting all the ID's and then LOOP through all of them, and then rewrite them to to + 1 Each time I make a Delete, so Each Time it will be a consistent 1 2 3 4 5 6 7 8 9 10 .... etc... Then I can reference from that to my Combo Box Selected Index + 1 to get the Correct Row which corresponds with the Selected Item.
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Jun 16, 2009
I'm using vb.net on vb 2005, I create datagrid view that when i click search button on the main form. It will show datagrid view that I want and when i click OK to select any record, the selected record will show on the desire text box in the main form. The problem is the record i choose is record no. 5 of all 10 record but the Bindingnavigator tools bar show that it's the first record of all 10 and when I click Next record arrow, the error message show that the 'PK column name' is unique and the 'value of the PK from my selected record' is already exist. [Code]
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Jul 8, 2009
For my database I need to create unique numbers and insert them in the column "ID". Can I add them via a SQL query? The numbers would simply be 0001 to whatever.I'm using the "Show Table Data" gui.
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Feb 20, 2009
I'm using vb2005. I'm writing a little application which allows a person to type in a new value in a combobox (which I've bound to a field in a table) which can be updated to the database. I then refresh the dataAdapter by clearing it and re-filling it again when the user saves a new item. That part works fine. My problem occurs when the user selects a stationary item from the combobox. The first select works fine until they try to select another item. Then I get the following error: ConstraintException was unhandled: Column 'TYPE' is constrained to be unique. Value 'False' is already present.
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Jun 5, 2011
I have this error, error Column 'Item ID' is constrained to be unique, what do I have to do to change it and the code
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Dec 16, 2009
Is there a way to get a subset of Unique values in column(1) of a DataView?
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Sep 30, 2010
My query returns 4 columns. One column is a unique identifier for the record. I'm trying to hide that column so the user doesn't see it. I'm going to add an edit button and hopefully I'll be able to allow the user to click on the record's edit button and edit only one of the remaining 3 columns and I expect I'll need that hidden value to do the update. I've got code below but it doesn't work. It gives me an exception, "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index ".
Dim MySqlCommand As New SqlCommand
MySqlCommand.Connection = MySqlConnection
MySqlCommand.CommandText = "SELECT ..................."
MySqlConnection.Open()
GridView1.DataSource = MySqlCommand.ExecuteReader
[Code] .....
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Jun 16, 2009
I'm trying to make a method that can get unique values from a specified column of a DataTable. The problem is that the column may be string, integer, etc. I'm not sure what type of variable the (Of T) is.
Private Sub GetColumnUnique(ByVal dbTable As DataTable, ByVal ColumnNumber As Integer, ByVal ColumnType As ???)
Dim results As List(ColumnType) = (From item In dbTable.AsEnumerable Select item.Field(ColumnType)(ColumnNumber)).Distinct.ToList
End Sub
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Nov 30, 2009
Is there any way to set a column to accept only unique values?(Via Table Definition)
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Mar 21, 2012
I'm using an Infragistics UltraWinGrid with a column of drop-down boxes. I don't want the user to be able to select the same value for multiple rows in that column. Is there a simple (or heck, I'd settle for advanced) way to do this? I'm using VB.NET
-EDIT-
I tried setting a filter on the data source for the drop-down box. But when I did that, the values in the other boxes in that column started disappearing (not the values themselves, but the descriptions that they were supposed to represent, so instead of reading "Information", it just said "1"). All of the cells in a column refer to the same combo box, so if you filter out a value from the data source for one of them, you filter it out for all of them. I'm currently trying to catch a CellChange event and check against all other currently-used values. If it was already used, I would put up a message saying as much and revert back to the old value. However, the value comes back as the previously-saved one, so... not helpful. About to see if I can use the "text" property.
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Jun 6, 2012
In my app, I connect to a table to get the next unique id (t_IDs). The code basicly looks up a specific table name and returns the next value. This is fine in testing, but the application is going to be used between multipul sites. I can see an issue where this may cause the app to slow down while it waits the next id before saving all the data to another table.
My question is, Is there away to set a SQL trigger to go and get the next id value and update the record when a new record is created? BTW - I did look at the uniqueidentifier option (NewId()) but the Id is too long. I need 1,2,3,4 etc.
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May 7, 2010
How can I query a DataTable to find all of the unique values in a column? SQL has the 'unique' or 'distinct' keywords, but I dont know how to do this against a DataTable.
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Sep 17, 2009
I am using vb.net code and sql server 2005. I have textbox in my application which is linked to a sql column. Now I want to check that it should not insert any duplicate record in table. I mean everytime it insert in table the value should be unique. data is inserted in table on button click.
I am using objectdatasource for sql connectivity and FormView for dataentry.
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Dec 6, 2009
creating unique IDs for each row in a table, to avoid duplicates when inserting the data to a server. The table looks like this:
+--------------+----------+------+-------------+
| brikkenummer | tid | post | anvendt_tid |
+--------------+----------+------+-------------+
| 3086360 | 09:43:02 | 98 | 09:43:02 |
[code]....
"Brikkenummer" is the number of a device that each person carries with him/her, and "tid" is the time the runner has passed a specific post. The post he/her has passed is described in the column "post".Out of these three columns, is it possible to generate some kind of unique ID? The ID that is generated have to be the same if a row is displayed twice or more, to avoid duplicate entries.
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Aug 25, 2008
how do i create restrictions whereby there cannot be two similar username in the table, while registering? i am using SQL server.
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Feb 1, 2011
im trying to join two tables together, (this messaging system) and im having trouble with the query.
Select Message_ID, Firstname, Surname , Subject , Message FROM messages, guardian_users INNER JOIN messages ON guardian_users.User_ID = messages.Sender_ID WHERE messages.receiver_ID = 3
and im getting this error: #1066 - Not unique table/alias: 'Messages' (joining tables Messages and guardian_users)
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Sep 21, 2010
I'm developing a policy administration system and I need to generate a unique policy in this formart
RP000000/HH
Where R is the Region i select from a Combobox, P is the product the client chooses and the auto generated six digit number and HH is the hour when the record was entered in the system. I want the auto generated number to be the ID in my ClientDetails table in my DB.Here is my code of what I have done so far.They want to be able to tell the region and the product by just looking at the policy number.
Private Function PolicyNumber(ByVal intRegion As Int16, ByVal intProductCover As Int16) As String
PolicyNumber = intRegion.ToString & intProductCover.ToString & "000000" & "/" & Hour(Now).ToString
End Function
[code]....
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Aug 10, 2011
I have a database, 3 or more tables and a one of them with 3 or more columns.In this table i have ID column, Name Column, Date Column etc.I like to select one record for printing and give to the person one or more Receipt of payment (bill).But every time i like the number of Receipt to be unique. For all persons in my table and all payment.
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Dec 14, 2011
I have:
- Table1 with columns: PK_ID1, LOCATION, DIRECTOR, SELLER, SELLERID, WORKTIME (relationship), WORKCODE
- Table2 with columns: PK_ID2, WORKCODE (relationship) & WORK_DESCRIPTION
My DataGridView do a SELECT * FROM Table1;How can I replace WORKCODE with WORK_DESCRIPTION in DataGridView, please?
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Mar 24, 2009
I am getting the error "system.argumentException; Column ' test_id2' does not belong to table Table. At System.Data.GetDataColumn( string columnname0 at system.data.datarow.get_item(string columnName).
This error is occuring right after I set the parametervalues in the report object of the Crystal report.(Note this a visual basic.net 2005 windows form application.)
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim cryRpt As New ReportDocument
Dim sql As String
[code]....
The value for the first parameter @Parm_1d1 value to the crystal report version 11 is correct. However, when trying to access the second @Parm_1d2 parameter ,the values past to the crystal report is not correct.
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Oct 23, 2009
I get a Syntax Error with the following code"ALTER TABLE receipts RENAME COLUMN payees TO payee"what I am doing wrong
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Apr 15, 2009
I am having major problems with creating my tables and populating them.The problem for the creating seems to lie when I try to create my table named WeeklyUnitStaffRota. I get the run time error 2147467259(80004005) No unique index found for the referenced field of the primary table. This has only started happening as I have been tinkering with my tables to get them to populate properly.I seem to have a problem when I have two columns with the same info but relating to a different college ie two MSC being run at 2 different colleges.[code]...
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Feb 13, 2012
I am using VB .Net to access the eBay API and store all completed orders in a database. This database is then fed into a proprietary shipping system, which can not handle an order number larger than 20 characters. eBay returns an order number like so 230407279314-680141236013 which is too long. The order number is always 12 numbers a hyphen and 12 more numbers. What I need to do, is turn this (the result can be alpha numerical) into a shorter, unique order key to store in my database alongside the true orderId (so that this can be referenced by the shipping software instead of the actual order number). The reason for the 20 character limit is the barcode algorithm used. Is there any way to achieve this in VB .Net 2010? This number can be anything unique, so long as it does not exist already (even a good uniqueid function would work, but I would have to query the database to make sure it isn't taken)
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Jan 10, 2009
I'm using the datagridview. This is the sample data:
[Code]....
How do I parse through the grid to rename the duplicate values in a particular column (in this example it's the l_name field) into such a format?
[Code]....
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