Solved

MS SQL 2012 SELECT without "empty" records

Posted on 2013-11-19
7
222 Views
Last Modified: 2013-11-24
Hi

I'm trying to SELECT into a new table where a particular column contains data which ignores the rows where a certain field is empty/null/whatever!

I've tried various ways, including the following:

SELECT *
INTO dbo.T_1213_OnlySSN
FROM T_1213_SSN
WHERE student_support_number IN (SELECT student_support_number FROM T_1213_SSN);

or

WHERE student_support_number Is Not Null OR student_support_number <> '';

or

WHERE student_support_number Is Not Null OR len(ltrim(student_support_number)) <> 0;

I've read around and think the field will be empty rather than Null, but none of these are working and I end with a load or rows where the student_support_number (nvarchar) has nothing in it.

Any ideas?

Thanks
Sarah
0
Comment
Question by:ScuzzyJo
7 Comments
 
LVL 48

Expert Comment

by:PortletPaul
ID: 39659063
why not try counting to help narrow down the problem?

select
  count(*) as count_all
, count(case when student_support_number Is Null then student_support_number end) as count_null
, count(case when student_support_number = '' then student_support_number end) as count_empty
, count(case when student_support_number Is Not Null or student_support_number <> '' then student_support_number end) as count_not_null_empty
from T_1213_SSN

what is this result?
0
 

Accepted Solution

by:
ScuzzyJo earned 0 total points
ID: 39659151
Hi Paul

Thanks for your help.  I've resolved this with the help of someone and have used:

SELECT *
INTO T_1213_OnlySSN
FROM T_1213_SSN
WHERE student_support_number != ''

This seems to work fine.  I'm not sure why/how, but will look into that.

Thanks
Sarah
0
 
LVL 48

Expert Comment

by:PortletPaul
ID: 39659166
!=

<>

are equivalents (both do "not equal")

which you stated you had already tried...
WHERE student_support_number Is Not Null OR student_support_number <> '';

glad it's resolved.
0
U.S. Department of Agriculture and Acronis Access

With the new era of mobile computing, smartphones and tablets, wireless communications and cloud services, the USDA sought to take advantage of a mobilized workforce and the blurring lines between personal and corporate computing resources.

 
LVL 11

Expert Comment

by:Louis01
ID: 39659191
Hi Sarah
Just a note on your SQL above. The
WHERE student_support_number != ''
would still return NULL values. Perhaps it is safer to use this:
SELECT *
INTO dbo.T_1213_OnlySSN
FROM T_1213_SSN
WHERE IsNull(student_support_number, '') != ''

Open in new window


NO points please, NO objections to Q being closed.
0
 
LVL 26

Expert Comment

by:Zberteoc
ID: 39659570
The problem is that you have some unprintable charatcers in your column which are not equal to '' even though it apperas empty and len(col) still is >0

In order to find thoese rows you can run:

select * from where PATINDEX('%[^0-9a-z]%', student_support_number)>0

This will return all the rows where student_support_number has anything that is not a digit between 0 and 9 or a letter between a and z. It is case insensitive.

If that query returns something you will have to clean the values in the student_support_number column.
0
 

Author Comment

by:ScuzzyJo
ID: 39659663
Hi Guys

Louis - when I looked at the data, I realised there shouldn't be any null values.  It comes from a download from a massive student database which won't allow them.  Thanks for the comment though, I'll bear it mind as it's bound to be relevant later on.

Z - thanks for yours too.  SSN's themselves can only contain digits and alphabet characters between a and z.  I take your point though and will watch out for it in future.

Thanks
Sarah
0
 

Author Closing Comment

by:ScuzzyJo
ID: 39672346
Resolved this with the help of someone else.
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Star schema daily updates 2 33
SQL Query Task 11 42
Regarding Disk IO 3 41
Connect remotely to SQL Server DB without TCP/IP enabled? 2 28
Let's review the features of new SQL Server 2012 (Denali CTP3). It listed as below: PERCENT_RANK(): PERCENT_RANK() function will returns the percentage value of rank of the values among its group. PERCENT_RANK() function value always in be…
A theme is a collection of property settings that allow you to define the look of pages and controls, and then apply the look consistently across pages in an application. Themes can be made up of a set of elements: skins, style sheets, images, and o…
Via a live example combined with referencing Books Online, show some of the information that can be extracted from the Catalog Views in SQL Server.
Viewers will learn how to use the INSERT statement to insert data into their tables. It will also introduce the NULL statement, to show them what happens when no value is giving for any given column.

685 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