DB/Reporting :: Selecting Within A Select Command?
Nov 1, 2010
I need to filter a measurements table that consists of 63 measurement objects that may or may not be tested more then once. The entries are put in a Batch table on a SQL server in the following fashion:
ID: | Serie | Test object | Min Amps | Max Amps | OK?
DateTime| String | Integer | Double | Double | Boolean
So there may be multiple entries in my database with the same series and testobject number but with (slightly) different results.
Currently I just select: SELECT * FROM Measurements WHERE Serie = 'XXXX' and use a datareader object to fill a datatable and then I let loose a routine on it that will either: Get the last result that produced a good measurement, so OK = 1 and max ID. Or the last result that produced a bad measurement if there are no good ones. I then end up with a list of 63 either good or bad measurement objects with the last good result, and if there isn't one then the last bad result.
Now I know that SQL is quite powerfull and I suppose that it must be possible to directly query for these results without a programatical routine re-filtering the results. I suppose it's like Selecting within a select statement..
I posted a while ago about having issues with a database, and selecting a value from the database. I was told that there were things missing from my code, and I've not gone back and added the things I was advised to. Now, my code seems to be working more, but outputting the wrong value.
i have a datagridview control called videoplaylisttable it shows data from ideoplaylistdataset.videoplaylistit has two columns.how do i make it so that when the user clicks on a cell, in any column, the entire row gets highlighted and not just the single cell
I have aspx gridview with checkbox on evryrow, what is required is whenever we check any of the rows, a query should be launched to change the specific agent -each row consist of agentID, Pass, Status- to Paid Status. using javascriptWhat I need to know is how to loop to get the Checked row and get the ID of the row checked so that I can get THe ID of the Agent in thos row so that I can update its status.using javascriptI found something similar on stackflow:t GridView selected row DataKey in JavascriptBut it is not my case, what is needed is at the check of a checkbox a javascript function should launch through which I could update the selected row in grid view after having the index of this row and this all to avoid refreshing the page.
Code: Private Sub DetermineTicketNumber() Dim objConnection As SqlConnection = New SqlConnection(strConnectionString) Dim objDataAdapter As New SqlDataAdapter
[code]....
My question is, how do I access the value that MAX() is returning from my SQL query?
I will have to perform updates/inserts/... on several relational tables of an Access database but I know that the Command builder usage is limited only to one table at a time.
i'm using this code to try and write a value to a table in an access database. when i try to write oledb.oledbcommandbuilder, intellisense doesn't recognize this but it doesn't throw an error up for that line either. when i try to execute this code i get the error "syntax error in UPDATE statement"
Code: Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUPdate.Click Dim myConnection As OleDb.OleDbConnection Dim ds As New DataSet
I'm experimenting with the sql command builder and it seems to do nothing when trying to update existing rows. If I create a new row and then add it then it works fine but I cant seem to update an existing record.
Heres what I have at the moment
Code: Dim strConnection As String = "Server=myServerSQLExpress;AttachDbFilename=C:databasepath estdb.mdf;" & _ "Database=testdb; Trusted_Connection=False;User Id=sa;Password=test;"
[CODE]...
But I'd really like to find out why its not working when using the command builder. I'm working with VB.net 2010 express and SQL server express.
Currently working on a web-service with Oracle10g as back-end. Here is my problem.
1. The table I need to populate has 100 columns. I have no control over the design of the table.
2. I wanted to use the "deriveparameters" method of OracleCommandBuilder, but found out that this is "costly" in terms of performance. What I initially planned to do was to derive the parameters from an open connection, close the connection, then maybe cache the parameters obtained but I don't know if this is possible.
I am unsure how big of a hit the performance will get if I continue using the "deriveparameters" method WITHOUT caching the parameters driven. The environment is as follows
-intranet -around 2000 users -users spread out in different parts of the country
I am not familiar where they will put the web pages of the application, the web service and the database. I don't know if they'll be putting it in different servers or on one server, but that's something we cannot control too, that's why I am looking for the best approach.
I just don't want to hard-code all that parameters and if, for instance, we need to change some properties/parameters, it will be a pain to maintain the code. It would be nice if someone here can point a way to automate the whole thing w/o the performance of the system taking a hit.
I'm having a problem with my Access database.I have to select the highest ActieAantal before the last action ( )because the last action is always the sum (Totaal).this is a part from my table
The next person also has some acties with corresponding Actieid and a Total when I use this query I alway get the 999 values
SELECT Register.Persoonid, Max(Register.ActieAantal) AS MaxVanActieAantal FROM Register GROUP BY Register.Persoonid ORDER BY Register.Persoonid, Max(Register.ActieAantal);
but when I try to exclude the 999 value I get nothing
SELECT Register.Persoonid, Max(Register.ActieAantal) AS MaxVanActieAantal FROM Register GROUP BY Register.Persoonid HAVING (((Max(Register.ActieAantal))<>999)) ORDER BY Register.Persoonid, Max(Register.ActieAantal);
find the highest 'ActieAantal' after excluding the 999 values?
Not sure if this is possible but can you use the select statements in VB to pull in from not just one but multiple tables and put the data in a gridview? [URL]
Code: Imports System.Data Imports System.Data.SqlClient Public Class Form1
I have more than 100 controls (labels, textboxes, menu, Gridviews etc).I want onclick a button to turn all these controls to visible = true Now I need to code them one by one. Is there a code (in VB if possible) to make it applies to all in the control ?
On button Click I want to Set the Select command of a Gridview. I do this and then databind the grid but it doesn't work. What am i doing wrong? [code]
I created a report viewer app that takes a command line parameter, the report filename, and opens the report. I also created a ODBC File DSN that I want to redistribute. However, currently, the DSN needs to reside in 'c:program filescommon filesodbcdata sources'. Is there a way for the report to look for the DSN in the application directory? Also, what components besides .NET 3.5 are required to redistribute the report and report viewer app?
I want to take a drop down menu. It will contain LastName, FirstName. I want that to select a record from a table. First Name and LastName are two different columns
Im new to database programming and was wondering if you can save a select statement to an array:I tried this but obviously wont work, does anyone have any ideas?
Code: Public Sub store_select_star_to_array() Dim myCommand
Ive got a web page so that the users select a day from the calendar and the date is input to a text box, the format is dd/mm/yyyy, it is the same format in the database table.
I want to select the data from the database when it is = the date in the text box but it is retrieving data in mm/dd/yyyy format. My sql is:
SELECT Booking.Date, Booking.RoomNo, Booking.Lesson, [NoComps] - " & students & " AS diff FROM Rooms INNER JOIN Booking ON Rooms.RoomNo = Booking.RoomNo WHERE booking.Date= #" & txtdate.Text & "# AND booking.Lesson = '" & lessonlist.SelectedValue & "' AND booking.Type IS NULL
how can i make sure it retrieves the data using the correct date format?
I am trying to use sql to select a row and then find the minimum and maximum values in the row, do some preprocessing, update the recordset using in visual basic 6.0, and then go ahead select the second row, find the minimum and maximum values again.. and go on, until the last row.
The problem is I am having difficulties using sql select for a ROWS.. I am aware how to do this for COLUMNS.. if I want to extract the first row from a recordset, find the min max values, and then, extract the second row and so on.. how will it be possible? (discouraged to use VBA, since i am limited to VB only)..
This example only lists two rows currently. I want to extract the minimum and maximum values from each row at a time, and then the second row. The reason for extracting minimum and maximum values is because I want to normalize my data in the range from 0 to 1.
Logic: After I find the min and maximum values for each row, I will use the recordset back, read the same row, and update every columns entry with my normalized data value... then proceed to the next row and do the same for every row in my database.
Im trying to get the soft recognize the timerange between times:
For example: START TIME: 10:00
[Code]....
I need to pick the time range between 10:00 and 05:00 in the morning.
I tried both - SQL Select and Visual Basic - both options didnt work when I needed to pick the time range as above. Normal ranges during the 24 hour cycle where ok.
I'm trying to create this select command against Access Database----Keeps giving me error saying operator is missing I just can't seem to figure it out
I use a Datagridview control, in which I need to display info and after that to export it to an excel document(but the export to excel part it's not important right now). I need to display in the Datagridview 2 fields:name and item, from a table(here 's where I thought I should use select) and also the value field which has to be calculated using a certain formula... Let's say value= a+b
I have a stored procedure that I need to be able to change the table name that the select statement in the stored procedure uses depending on a user input, however I am having a problem with the code:
Code: CREATE PROCEDURE [dbo].[spQryParentComments] @projTable as varchar(50) AS
I'm just a frustrated noob trying to get past my first DB Program. My goal is to get relational data from different tables all ordered by a certain field..Ive noticed early on that i cannot select a column when its name has a space.[code]Now the statement i want to use is sql = "SELECT [PT.Chart Number],[PT.Last Name],[CA.Case Number] FROM Table1 AS PT INNER JOIN Table2 AS CA ON PT.Chart Number = CA.Chart Number ORDER BY PT.Chart Number"..When i Debug i get the same type of error ("... Can't find column name PT.Chart... ")I'm new to sql so i dont know if my syntax is off.
