Sql query to get how many times row values changed for each row

Question

0.00/5 (No votes)

See more:

I have following table in SQLserver database
I want to get number of time RAM has changed

SQL

-----------------------
sr  Machinename   RAM
----------------------
1.  Comp-1        20
2.  Comp-2        40
3.  Comp-1        15
4.  Comp-1        10
5.  Comp-2        40
6.  Comp-2        30 
----------------------

I want following output

SQL

-----------------------------------------
sr  Machinename   No.of time RAM changed
-----------------------------------------
1.  Comp-1        3
2.  Comp-2        2 
-----------------------------------------

NOTE:Comp-2 has 3 rows but 1 row having same RAM value so its not counted as changed value

What I have tried:

WITH CTE AS(
  SELECT ROW_NUMBER() OVER(PARTITION BY Compname ORDER BY RAM desc) as rowid,Compname, RAM
	FROM tblA) 
	select * from cte

Posted 24-May-19 3:24am

Sunil Bansode

Updated 24-May-19 3:36am

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Maciej Los · Answer 1 · 2019-05-24T03:37:00

Solution 1

Depending on what you mean by "to get number of time RAM has changed"...

Try this:

SQL

SELECT Machinename,  COUNT(RAM) AS CountOfRAM
FROM YourTable
GROUP BY Machinename

or:

SQL

SELECT Machinename, COUNT(DISTINCT RAM) AS CountOfRAM
FROM YourTable
GROUP BY Machinename

Posted 24-May-19 3:37am

Maciej Los

Updated 24-May-19 3:38am

v2