Solved

Count statement with group...

Posted on 2014-12-17
5
109 Views
Last Modified: 2014-12-18
Hello, can someone let me know how I can write a statement that firsts groups by column A and then give a count of values in column B. For eg;
Col-A(Cust ID)         Col-B
100                          Closed
200                          Active  
200                          Active
100                          Closed
300                          Open
400                          Progress
500                          Active

Output I am looking for is:
Col-B   count
Closed  1
Active    2
Open     1
Progress 1

Thanks for the help.

A
0
Comment
Question by:aej1973
  • 2
  • 2
5 Comments
 
LVL 65

Expert Comment

by:Jim Horn
ID: 40506257
> firsts groups by column A and then give a count of values in column B.
Not quite sure I'm following your logic here, as the sample data set doesn't translate to the data mockup.  
There are seven rows in your sample data set, and only five in the result set.
Select ColB, COUNT(ColB) as the_count
FROM YourTable
GROUP BY ColB

Open in new window

0
 

Author Comment

by:aej1973
ID: 40506280
I am sorry if I did not make myself clear. Let me explain;

The first grouping should be with reference to  Col-A. So the outcome would be:
Col-A Col-B
100    Closed
200    Active
300    Open
400    Progress
500   Active

The next grouping and count should be with reference to col-B, the output will be;
Col b      count
Closed     1
Active      2
Open       1
progress 1

How can these two steps be combined into one query? Thanks for taking a look at it.

A
0
 
LVL 65

Accepted Solution

by:
Jim Horn earned 500 total points
ID: 40506313
Okay, try this then:
IF OBJECT_ID('tempdb..#tmp') IS NOT NULL
   DROP TABLE #tmp
GO

CREATE TABLE #tmp (ColA int, ColB varchar(25)) 

INSERT INTO #tmp (ColA, ColB)
VALUES 
   (100, 'Closed'), (200, 'Active'),  (200, 'Active'),(100, 'Closed'),
   (300, 'Open'),(400, 'Progress'),(500, 'Active')

SELECT a.ColB, COUNT(a.ColB) as [Count]
FROM (
   Select ColA, ColB
   FROM #tmp
   GROUP BY ColA, ColB) a
GROUP BY a.ColB

Open in new window

0
 
LVL 24

Expert Comment

by:chaau
ID: 40508156
All you need is to count DISTINCT values, like this:
Select ColB, COUNT(DISTINCT ColA) as the_count
FROM YourTable
GROUP BY ColB

Open in new window

0
 

Author Closing Comment

by:aej1973
ID: 40508274
Works! Thank you.
0

Featured Post

Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.

Question has a verified solution.

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

Suggested Solutions

All XML, All the Time; More Fun MySQL Tidbits – Dynamically Generate XML via Stored Procedure in MySQL Extensible Markup Language (XML) and database systems, a marriage we are seeing more and more of.  So the topics of parsing and manipulating XM…
As a database administrator, you may need to audit your table(s) to determine whether the data types are optimal for your real-world data needs.  This Article is intended to be a resource for such a task. Preface The other day, I was involved …
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

840 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