SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Query


Query

Author
Message
journey to ssc
journey to ssc
Forum Newbie
Forum Newbie (4 reputation)Forum Newbie (4 reputation)Forum Newbie (4 reputation)Forum Newbie (4 reputation)Forum Newbie (4 reputation)Forum Newbie (4 reputation)Forum Newbie (4 reputation)Forum Newbie (4 reputation)

Group: General Forum Members
Points: 4 Visits: 7
Hi all,

I am facing a problem in writing a query.
Here is my requirement
i have a <products> table with columns <productid> <productname> <manufactureDate> <DeliveryDate>
and some columns are filled with null values
i am trying to find the number of null columns with a counter.
the execution flow has to be like whenever i come across a null the counter has to be incremented by 1.
kindly help me in writing this query.

Regards
--------------
Trainee SQL
Lowell
Lowell
One Orange Chip
One Orange Chip (28K reputation)One Orange Chip (28K reputation)One Orange Chip (28K reputation)One Orange Chip (28K reputation)One Orange Chip (28K reputation)One Orange Chip (28K reputation)One Orange Chip (28K reputation)One Orange Chip (28K reputation)

Group: General Forum Members
Points: 28095 Visits: 39935
what you want to do here is use some customa ggregation:
a SUM(CASE statement can help you generate the counts in a single statement

something like this:

SELECT
COUNT(productid) AS Totalproduct,
SUM(CASE WHEN productname IS NULL THEN 1 ELSE 0 END) AS Nullproductnames,
SUM(CASE WHEN manufactureDate IS NULL THEN 1 ELSE 0 END) AS NullmanufactureDate,
SUM(CASE WHEN DeliveryDate IS NULL THEN 1 ELSE 0 END) AS NullDeliveryDate
FROM products



Lowell

--
help us help you! If you post a question, make sure you include a CREATE TABLE... statement and INSERT INTO... statement into that table to give the volunteers here representative data. with your description of the problem, we can provide a tested, verifiable solution to your question! asking the question the right way gets you a tested answer the fastest way possible!

Dawn W
Dawn W
Mr or Mrs. 500
Mr or Mrs. 500 (578 reputation)Mr or Mrs. 500 (578 reputation)Mr or Mrs. 500 (578 reputation)Mr or Mrs. 500 (578 reputation)Mr or Mrs. 500 (578 reputation)Mr or Mrs. 500 (578 reputation)Mr or Mrs. 500 (578 reputation)Mr or Mrs. 500 (578 reputation)

Group: General Forum Members
Points: 578 Visits: 601
Search for DO WHILE, Cursors, and variables. You'll learn more if you figure it out yourself.

If you really want to learn more, look on Microsoft's site for webcasts and read the Stairways on this site.
Phil Parkin
Phil Parkin
SSCoach
SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)

Group: General Forum Members
Points: 18379 Visits: 20422
It's not totally clear how you want to see the results. The following queries give you a count of NULLs in each column, for all rows in the table:

declare @Rows int

select @Rows = count(1)
from Product

select Col1Nulls = (@Rows - count(Col1))
,Col2Nulls = (@Rows - count(Col2))
from Product



If that's not what you need, please read the link in my signature and provide DDL, sample data and desired results.


Help us to help you. For better, quicker and more-focused answers to your questions, consider following the advice in this link.

If the answer to your question can be found with a brief Google search, please perform the search yourself, rather than expecting one of the SSC members to do it for you.

Please surround any code or links you post with the appropriate IFCode formatting tags. It helps readability a lot.
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search