Solved

convert sql query to linq query

Posted on 2011-03-16
5
601 Views
Last Modified: 2013-11-11
Hi,

Can someone please convert the following sql query to linq please?

it should list unique records and how many records there are with that text
SELECT distinct columnname as var_text, COUNT(columnname) as var_count FROM tbl_data where columnname > '' GROUP BY columnname

Open in new window

0
Comment
Question by:OTM
  • 2
  • 2
5 Comments
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 35147631
Here's my interpretation:
var results = from item in (from columnname in tbl_data
                            where columnname > ''    // Not sure why greater than empty string, but copied nonetheless
                            select columnname).Distinct()
              group item by item into g
              select new { var_text = g.Key, var_count = g.Count() };

Open in new window

0
 
LVL 11

Expert Comment

by:Kusala Wijayasena
ID: 35150758
kaufmed, I think your solution should be corrected as follows

var results = from item in (from tbl in tbl_data
                        where tbl.columnname.Trim().Length > 0
                        select tbl.columnname).Distinct()
group item by item into g
select new { var_text = g.Key, var_count = g.Count() };

Open in new window



-Kusala
0
 

Author Comment

by:OTM
ID: 35150971
thanks kusala, that lists the distinct entries correctly but lists the count for each one as 1. My aim is for the var_count field to be the total no. of records with the columnname text being var_text.

i hope this makes sense, thanks again.
0
 
LVL 11

Accepted Solution

by:
Kusala Wijayasena earned 500 total points
ID: 35151064
OK, if your requirement is that, change the query as follows

var results = from tbl in tbl_data
              where tbl.columnname.Trim().Length > 0
              group tbl by tbl.columnname into g
              select new { var_text = g.Key, var_count = g.Count() };

Open in new window


-Kusala
0
 

Author Closing Comment

by:OTM
ID: 35152237
kusala, thats great. It does exactly what i needed :-D
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A long time ago (May 2011), I have written an article showing you how to create a DLL using Visual Studio 2005 to be hosted in SQL Server 2005. That was valid at that time and it is still valid if you are still using these versions. You can still re…
Exception Handling is in the core of any application that is able to dignify its name. In this article, I'll guide you through the process of writing a DRY (Don't Repeat Yourself) Exception Handling mechanism, using Aspect Oriented Programming.
This Micro Tutorial will give you a basic overview how to record your screen with Microsoft Expression Encoder. This program is still free and open for the public to download. This will be demonstrated using Microsoft Expression Encoder 4.
In a recent question (https://www.experts-exchange.com/questions/28997919/Pagination-in-Adobe-Acrobat.html) here at Experts Exchange, a member asked how to add page numbers to a PDF file using Adobe Acrobat XI Pro. This short video Micro Tutorial sh…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question