ADO.NET :: How To Write A Query That Pulls Records From A Master Table
Mar 18, 2011
Being new to Linq and Entity Framework, I find myself struggling to write queries that are relatively simple in SQL. My latest challenge is how to write a query that pulls records from a master table and includes a column for aggregating data from related detail records. Let's start with this example:
List<Customer> list = (from x in Customer select x.Customer_ID, x.CustomerName).ToList();
Now I'd like to modify this so that I include a column indicating how many orders each customer has, where there is a one-to-many relationship between the Customer and Order entities. I suspect the solution might result in a List of an anonymous type rather than the List of Customer like my example, but that would be
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Mar 27, 2011
I have two tables and following are the structure of both the tables
Tbale 1
Field1 Field2 Field3
d1 01 26/03/2011
d2 02 26/03/2011
d3 03 27/03/2011
Table2
Field1 Field2 Field3
01 6.15 14.25
02 7.30 16.25
03 6.00 18.25
My expected output when i search records by table1.field3 (say 26/03/2011)
Tbale 1
Table1.Field1 Table2.Field2 Table3.Field3 Table2.field2 Table2.Field3
d1 01 26/03/2011 6.15 14.25
d2 02 26/03/2011 7.30 16.25
d3 03 27/03/2011
Inorder to get the above result, what query should i write?
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Oct 11, 2010
I need to write a query as follows which will be bound to a grid
select top 25 * from ErrTable Order by DateErrorad Desc
However, I need to write this query to return only 25 records at a time, but when a user clicks next it will display the next 25 most recent records from the db.
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Jan 16, 2010
i have a table for customer forecast with following fields.. customer, year, week, quantity. now i need to write the SP to retrive the records based on the from week,year and to week,year... like this... from 45th week of 2009 to 25th week of 2010. how can write the query...
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Feb 15, 2011
I have a dropdownlist that pulls from a datasource. When a name is selected all information drops down to a formview. Once there 3 fields get populated from the dropdownlist and then there is 2 other fields that need user input. Once they hit submit, it should write to a different table in the same DB. I cannot get the fields to populate and write to the DB. Here is my code:
[code]...
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May 2, 2010
I want to write the query for finding second highest salary in my employee table how to find it??
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Oct 1, 2010
Suppose we want to select the data from the database then we write the query for that. Example:
SqlConnection con=new SqlConnection(Connetion name) string selectPkId = @"SELECT PK_ID FROM TABLE" SqlCommand cmd=new SqlCommand(selectPkId ,con);
So,my question is that why we basically use @ before the sql query.If I don't use @ before that then it again work fine (does not give any error), then what is need of using "@"?
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May 31, 2010
I have a datagrid control which is bound to a table which containing more than 1000 records. And i want to show only 25 records once a time. I have used paging in datagrid. But each time the next page index is set, query is fired again. This takes lots of time. So what is the easiest way to bound data in this case to improve performance.
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Nov 29, 2010
I want to know how to Update / delete the table records in ASPNETDB.MDF in single update / delete query ?
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Mar 19, 2011
I am facing a big problem with simple linq query.. I am using EF 4.0..
I am trying to take all the records from a table using a linq query:
var result = context.tablename.select(x=>x);
This results in less rows than the normal sql query which is select * from tablename;
This table has more than 5 tables as child objects (foreign key relations: one to one and one to many etc)..
This result variable after executing that linq statement returns records with all child object values without doing a include statement.. I don't know is it a default behavior of EF 4.0 . I tried this statement in linqpad also..but there is no use... But interesting thing is if I do a join on the same table with another one table is working same is sql inner join and count is same..but I don't know why is it acting differently with that table only.. Is it doing inner joins with all child tables before returning the all records of that parent table?
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Nov 5, 2010
I have a SQL Data Source that displays records after going through the Query Builder and select "Test Query" yet when I save it, go back to the design mode and select View in Browser I get nothing but a blank screen.
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Jul 30, 2010
I have an "Edit" page that uses a FormView bound to an EntityDataSource. The page is called with the ID field of the record to edit in the query string: "EditEmployee.aspx?ID=10". The EDS the FormView is bound to is using: AutoGenerateWhereClause=true and a QueryStringParameter. Below the FormView I have a ListView that contains some child records of the FormView. The ListView is bound to a seperate EDS and also uses the (same) QueryStringParameter.
The problem I am having is when this ListView attempts to Insert or Edt a column I receive an error because I don't have the ID field (EmployeeID) of the parent bound anywhere in the ListView (and obviously, it is setup as a ForeignKey so it fails, like it should). Any advice on the best way to get this ID (EmployeeID) column bound in the ListView? There are many things I can do in code behind, but I would like to solve this in the markup if possible. I can move the ListView so that it is inside of the FormView if necessary.
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Nov 18, 2010
I have an Access 2010 DB that I have a table of RAW data in. In my scenero when table 'a' has been populated all the rows with the updatedate of Now() get moved to another table... the SQL is like this...
[Code]....
As you can see it is a very simple query but it does NOT return any rows. There are actually 404 rows with todays date in teh Append_Date column.
I am stumped as to why it does not return rows?
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Oct 29, 2010
I have two tables for storing language translations - tblEN and tblES. They have the same structure which is nvcEnglish and nvcLocal - both nVarChar fields.
In nvcLocal of the Spanish table, I enter the Spanish translations of words and phrases used within my app. Problem is, when I add a bunch of new records to the English table I also have to go in and repeat the data entry into the Spanish table. I am wondering if there is a way to import the newly added records into the Spanish table using Transact SQL?The plain language query would be something like:
If the data in tblEN.nvcEnglish does not exist in tblES.nvcEnglish then insert a new row into tblES with the values from tblEN
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Mar 9, 2010
When i click the reset button, the password is updating in the table.
i.e.,
update UM_USER set password='ahlnhTczpihljbIn', exp_date='01/JAN/2008' , max_sessions=3
How to write the stored procedure and call the procedure in .Net coding?
The codes are below:
[Code]....
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Jan 15, 2010
[code]...
This query works perfectly on the query analyser.
But when configuring the Table adapter ,I try executing the query and i get 0 rows affected.
What could I be getting wrong in this case.
NB:Existing GalleryID has been supplied.
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Mar 2, 2011
I am trying to create statitics for game downloads and am having dificulty with a sub part of my query. the goup by command is not having the disired result and i think i have been looking at it too long to see what i am doing wrong. [Code]....
At the moment it is producing each result in many rows when only 4 rows should appear. its the download column that is doing it. needs to be sub queried or something to display total in relation to month,gameid,userid.
Month-download-GameID-UserID
1 1
1 1
1 1
1 1
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Mar 6, 2011
A follow up question concerning the DAL layer part .. The first question about dealing with large objectsI have one table (PlacesTable) that is connected by like 6 other tables (1:Many and Many:Many relations)
In my DAL should I put a big query that join the 6 tables + the m:m reference tables (btw it produces multiple data that I don't need Please refer to my old question) and place all the data in it's specific object property or, should I use a single query for each table and create an object for each fetched table .. and finally send those to the UI ?If I wasn't clear enough please let me know what I further information do you need to know!
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Aug 7, 2010
I have two tables and I want to display the second one based on the primary key:
the first table is tbl1 (id,fName,lName), and the second one is scnds(id,course,tbl1id).
I am practice using MVC 2.0, so I bulilt the the class repository
[Code]....
Then created the Studentcontroller
[Code]....
The problem is if I used Details method it will show only the first record, but I want to display every course that specific a student has. I don't know if the problem in repository or in the controller.
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Jan 11, 2010
I have a very simple page that displays a link for each rolegroup that a member belongs to with ASP.NET membership, lets say Group1 and Group2. For some reason, I can only see the first of two links in a list, regardless of which group it is.
I've already verified that both groups are pulling in fine by moving the Group2 link above Group1 to see if it could be viewed: which it was!
If Group1 is listed above Group 2, I see the link to Group1. But if I move the link for Group2 above Group1, I see the Group 2 link. I don't have a bunch of snazzy-dazzy complicated code on this page, so I'm stumped. Why could this be happening? Here is my code:
[Code]....
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Oct 13, 2010
How I can write following SQL query using LINQ. There is no default constraint define for the ID column so we have explicitly pass the NEWID().
I want to replicate the products of a company to another company.
Insert Into Products Select NEWID() AS ProductID, ProductName, CompanyID = @DestinationID, ProductCategoryID From Products Where CompanyID = @SourceID
Also once I get these result how can I use InsertAllOnSubmit to insert all the records at once without looping it.
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Aug 16, 2010
how to write sql query to retrive data as follows....
've a table with two columns..
brno brname
100 hyd,hyderabad
102 cni,chennai
03 mm,mumbai
104 kalk,kolkata
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Mar 24, 2011
SQL query:
I have a hierarchy structure like:
B reports to A
C reports to A
D reports to A
E reports to B
F reports to B
and so on......
So, when A logins he should be able to see B,C,D(who are reporting to A) and also E,F(who are actually reporting to B and not directly to A)Please help to write such sql query.
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Jan 21, 2010
why I get the following error: Query input must contain at least one table or query
for this code...
Insert into BlogPost (BlogID,BlogTitle,BlogContent,Attatchments,IsEnabled,IsVisible) values
((SELECT BLOGID FROM Blog WHERE BlogOwnerID =7),'test','aaaaa','aaaa',true,true);
all i know that it is a problem with how i have nested the select statement...
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Jul 29, 2010
I have users input links (like file paths and web pages links) to a database via a form. When they put file paths (e.g C:Program Files...) it stores them properly.However, I have a page in my application that pulls the links from the database so that the user can click on those links. For links which include spaces (like the one I just used as an example) it replaces the space with %20 ... This messes up my link and it doesn't work. How can I fix this?-I number records that are saved into my database in a specific way. I have an ID for each record which is a two digit number. For number that are low (1-9) I would like it to display as 01, 02, 03, etc. But if I save it in that form into the database, it goes from 01 to 1.How can I fix this? Users need to see it as 01, 02, etc...
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