Run Aggregate Query Against A Datatable?
Mar 9, 2010
I do have a datatable filled from a flatfile (say .txt). After the datatable is populated, I manipulate the data. After datamanipulation I want to do some analysis of the content of the datatable. For this analysis, I need to aggregate the data.
To keep it simple, let's say I have single orders of customers in the datatable and now I want to get the total order amount for each customer (SQL: SELECT Customer, Count(Ordervalue) FROM Ordertable GROUP BY Customer).
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May 28, 2012
i have 1 query with aggregate with condition using access
SELECT
HD.No,
SUM(IIf(DT.Status = 'A', 1, 0)) AS One,[code]...
i can run it in access but not in .Net QueryBuilder
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May 24, 2010
I'm having trouble getting my head around converting a traditional SQL aggregate query into a LINQ one. The basic data dump works like so:
Dim result =
(From i As Models.InvoiceDetail In Data.InvoiceDetails.GetAll
Join ih As Models.InvoiceHeader In Data.InvoiceHeaders.GetAll On i.InvoiceHeaderID Equals ih.ID
[CODE].....................
What I need to really be getting out is ih.Period (a value from 1 to 12) and a corresponding aggregate value for i.ExtendedValue. When I try to Group ih I get errors about i being out of scope/context.
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Aug 6, 2010
Given a table like
ID | Name | City
1 | X | Y
2 | Z | Y
[code].....
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Apr 12, 2012
I've got a 2 part question: First question: I know that there is a query limit of 5,000 records when querying records, for performance reasons, but is there a limit when doing an aggregate query? If so, what is it? I need only to query the number of records and for one entity I can get a result of 39,000+ records, but for another entity I see an error message like:
[Code]...
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Jul 1, 2009
I am working on an application in Visual Basic Express using an Access 2000 database.I am trying to get athe following SQL query to work but get an error in Access.
The query is:
SELECT [ID], [Title], [Author], [Series], [YearPublished], [ISBN], [CoverPrice], [Style], [Condition], [Signed], [Comments], Count([Title]) AS CountOfBooks, Sum([CoverPrice]) AS TotalCoverPrice
FROM tblBooks
WHERE ID=[@ID];
The error is:"You have tried to execute a query that does not include the spec ified expression 'ID' as a part of the aggragate function."
The query works fine without the 'Count' and 'CoverPrice' count and sum to the query.
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Nov 18, 2009
load the contents of a query from a dataTable Adapter into a datatable?
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Oct 15, 2011
I created a RDCL in the designer. I would like the User to Determine what is shown in the Report. How can I change the query at runtime? (ex. changing the customer Name)
This is the query that I have in the properties:
SELECT [Date], Address, Customer, Orders
FROM Report_qry
WHERE (Customer= 'JohnDoe')
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Feb 20, 2012
I have an untyped dataset which is populated at runtime. I need to look for a Datarow in the datatable containing a specific value in one of its column ("ID") and when found should set the other column value ("Value") on the same Datarow. How to do it?I tried the following to get the DataRow:
Dim foundrow As DataRow = dt.Rows.Find(ID)where dt is my Datatable and ID is a String variable which is to be found.I always get Nothing as return. I checked the datatable just before executing that line: it has over 100 rows and the the ID to be found is there. I stil get Nothing as return.
[Code]...
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Oct 22, 2011
If I would connect to database I would run a query like this: "Select distinct Column1, column2 from tablename where somefield=somevalue order by column2". How can I run this query to a datatable? I know .select but that's not enough like dataset.datatable("name").select(filter,short). Still need distinct.
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Mar 22, 2011
How do I query a DataTable where a value has an apostrophe in it? For example, my datatable has a lastname column and I want to search for the name "O'Bryan", how would I do it? With an SQL query I would just use a parameter & it would take care of the apostrophe automatically. Is there a way to use parameters with a DataTable?
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Apr 5, 2011
I'm using VB.Net to create a windows form application. One form has a DataGridView that displays data from a SQLServer table via a TableAdapter and BindingSource whose filter is set as I need it. Elsewhere on the same form I would like to show totals for four columns of the same table, but from a totally different set of rows. All I've been able to figure out is to create another TableAdapter - but this seems foolish since the SQL table data has already been brought into my application by the first TableAdapter.Is there a way to run a query on the DataTable that was filled by the first TableAdapter, and how do I get the query results?
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Nov 20, 2011
I have pulled information from a database into a datatable (dtCustomerInfo) then I expanded on the columns by processing the data and I can display this in a datagridview without any problem. However, the data is in detail and I want to ultimately summarize by customer name.The code below has a commented sql statement that is the statement I ultimately want but it is not working. However, the idea is that I want to Select from one datatable into another but run aggregate sum on several columns so that I will get one record per customer showing totals for each column.So I broke it down to just pull all data possible into the second table.[code]I do know the grouping in the current select * statement does nothing but my issue is more that the columns do not show up.
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Aug 19, 2009
I have a function (GetData) that parses a SQL string, makes a connection to a SQL Server and dumps the result to a DataTable. It works perfectly on a series of SQL calls I have. I have new query I have added and now the function balks at the adapter.Fill(table) call. I do not understand why the call fails. The SQL portion works fine when run directly against the SQL database (Management Studio). I am thinking the fuctions not capable of dealing with the subquery somehow, just not sure why.
Bindingsource4.DataSource = GetData("SELECT QTY,ITEM_NUMBER,DESCRIPTION,(Select STATUS_TEXT From ITEM_STATUS_LIST Where STATUS_VALUE = Line_Items.Status) FROM(LINE_ITEMS) JOIN PURCHASE_ORDERS ON
[Code]....
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Jul 20, 2010
How can i write this query with LINQ to a FoxPro database?SELECT count(*) FROM Table group by item1I wrote it as below, but it doesn't work
Dim Query
Dim dt As New DataTable
Dim da = New Odbc.OdbcDataAdapter("SELECT * FROM table1",connection)
[code].....
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Mar 21, 2012
I do have the following problem extracting records from a datatable, based on date.
I am using Datatable.compute to sum the relevant rows, at least I'm trying to!
CrTot is a variable of type double
BankTrans is a datatable
dteRecDte is a datetimepicker component
CrTot = BankTrans.Compute("sum(bank_amount)",
"bank_amount > 0 And date_bank_reconciled <="
& dteRecDte.Value.Date)
doing the sum calculation on it's own works properly. I now need to check that the date of the "date_bank_reconciled" field is less than or equal to the value of the date entered in the datetimepicker "dteRecDte.Value.Date", so that only rows with a date either less than or the same as that in the datetimepciker are returned.
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Feb 18, 2010
I have an SQL table(for example, it have 1 column "kod" with 3 rows:1,2,3 ). To operate it, I used class LINQ to SQL and I create tmp dataset with one table, with one column "col" with values - 2,3,4. To operate with this tmp table i use IEnumerable(T).I want to find only new values in tmp table and write its in SQL table. To find this values, i want to use LINQ query. Queris to each table are worked well. But query for 2 tables don't work.
Imports System.Linq
Imports System.Data.Linq
Public Class Form1
[code]....
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Dec 19, 2009
How do I perform an sql query onto a DataTable not a Database table?
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Jun 14, 2009
I wrote a procedure that builds a DataTable in memory using data stored on our DB2 database. The function builds a Multi-Level Bill of Materials (BoM), meaning that the data cannot simply be queried. The function works great and returns a nicely arranged DataTable object. However, I then need to query the in-memory DataTable against other tables on our server. What would be the best way to approach this problem? Should I make a DataTableAdapter for the Server tables and then build a DataView? I don't have too much experience yet with Data objects. (By the way, I looked into LINQ to DB2 and even installed IBM's addin's, but our server doesn't seem to support it at this time.)
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Nov 7, 2011
i need to query the datatable & set the outcome as datagridview controls datasource
vb.net
Private Sub Txt_Search_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Txt_Search.TextChanged
'routine objective:- Filter datatable & set the datagridview datasource
[code]....
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Jul 12, 2011
I'm trying to query a DataTable to get a collection of rows but I'm finding that my search string has to be the exact length of the columns width. So, for example this won't work:
Dim rows As DataRow() = (From r In myTable.AsEnumerable() Where r.Field(Of String)("fname") = "Bob").ToArray()
...but this will:
Dim rows As DataRow() = (From r In myTable.AsEnumerable() Where r.Field(Of String)("fname") = "Bob ").ToArray()
The search term ("Bob") has to be padded with spaces to make it equal in length to the column width (10 characters). Is this how it's supposed to work or am I doing something wrong?Also, how can I do a LIKE search? So for example, I want to search for all names that start with "Bo" or whatever. ie. "Bo*".
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Oct 19, 2011
I have a string like "Hello'World" and a Data Table with some records in it. One of those records is "Hello'World".he problem is, when I do a .Select in the Data Table, it only tries to search for the "Hello" part and throws an error on "World" because it interprets the ' (single. cuote) like the closing cuote on sql.DataTable.select("text = 'Hello'World'")I have gone through msdn doc, and it says I can escape some characters with [] brackets or f.slashes , but I just can't figure out: .select("text = 'Hello[']world'")
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Dec 6, 2009
I have a set of LINQ queries filtering original datatable (loaded from Excel file) based on user selections in Comboboxes. Then the result is joined with Arraylist to further filter the set. Arraylist is a simple list of strings.
Query:
If (Samples.Item(0) Is Nothing) = False And Samples.Item(0) <> "All samples" Then
queryResults = From records In queryResults Join samp In Samples _
On records("SAMPNUM") Equals samp _
[Code]....
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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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Dec 17, 2009
VB.Net 2005 SQL server 2005
I have a project I have a dataset that contains tables In the dataset designer, each table has a defaiult FILL command set. I have draged and droped my table as a grid onto my form VB automatically sets up the table adapter, and binding source to make it all work.
in my code, is placed in the form load routine, a tableadapter.fill(dataset.datatable)
Here is my dilemma. The data in my table may have 100's of thousands or rows.
I have presented the user with a front end that allows for filterring and selecting based on several columns. reguardless of how many rows the result set contains, there will always be the same columns in the dataset.
Because there are so many combinations of select query, i do not want to make 20 or 30 custom fillby's in the dataset. I want to make an addhoc select query and have the binding source and table adapters work as expected. I have created a query called "FillByCustom" in the dataset designer attached to the DataTable Adapter section.
My question is this.
If i build a select query that returns the desired rows, how do i place it into the adapter in place of the FILLBYCUSTOM select command, such that it all works as expected?
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Jan 29, 2011
I would like to send json data from a HTML table to the ASP.NET code-behind and update the data in and SQL Server database. The code and JSON for the TableProductToUpdate() is below.
function UpdateProductTable() {
$.ajax({
type: "POST",
[code].....
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Jan 25, 2010
I'm trying to do a LINQ Query against a typed datatable that will return me duplicated data.With out going into too much detail, here's the basic setup:
strCode1 - string type
intCode1 - int32 type
intAdjustor - int32
There are more fields but these are the ones that are important.I'm going to do my best to describe this, as it's kind of confusing.In theory intCode1 is a key for strCode1 (hence the names). So each time intCode1 is duplicated, the same strCode1 should appear. Example:
[code]...
Ultimately I'd like to get a List(Of T) - where T is my typed data row. In SQL, I would simply use a sub query, to get a distinct list of strCode1 and intCode1, then do a count, grouped by strCode1 where I get more than one row.I'm not sure how to translate that into LINQ, AND get the original types data rows returned in a list.
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Jul 25, 2011
I have a code in VB .NET:Aggregate item In items Into Sum(item.Value)
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Jun 30, 2009
Given....
Public MasterList as IEnumerable(Of MasterItem)
Public Class MasterItem(Of T)
Public SubItems as IEnumerable(Of T)
End Class
I would like a single IEnumerable(Of T) which will iterate through all SubItems of all MasterItems in MasterList
I would like to think that there is a Linq facility to do this, or an extension method I am overlooking. I need a mechanism that works in VB9 (2008) and hence does not use Yield.
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Nov 1, 2011
How to Aggregate field's numeric value..? in visual basic 2010.i am created a form with a datagridview and a textbox .datagridview binding with a table. in visual basic 2010 and SQL Server 2008R2
table fields and datagridview columns are like below
[Code]...
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