Solved

Help With Query

Posted on 2013-11-13
7
130 Views
Last Modified: 2013-12-23
Hi,

I have table like this:

char_id
object_id
char_value
number_value
date_value
blob_value


The rules to this are per row only 1 out of:
char_value
number_value
date_value
blob_value

will ever be populated. There will never be circumstances where all 4 are null

Can a select statement (or function) be created that will only ever return the not null value?

At the moment I’m returning 4 columns, 3 of which are blank.

TIA
0
Comment
Question by:andyw27
7 Comments
 
LVL 15

Expert Comment

by:Ess Kay
ID: 39645301
give an example of what u want and what u get
0
 
LVL 15

Expert Comment

by:Ess Kay
ID: 39645313
Something like this:



SELECT "char_value" AS NAME, char_value AS Value FROM yOURtaBLE where char_value  isnot NULL
UNION
SELECT "date_value" AS NAME, date_value  AS Value FROM yOURtaBLE where date_value isnot NULL
UNION
SELECT "number_value" AS NAME, number_value AS Value FROM yOURtaBLE where number_value isnot NULL
UNION
SELECT "blob_value" AS NAME, blob_value AS Value FROM yOURtaBLE where blob_value isnot NULL
0
 
LVL 65

Expert Comment

by:Jim Horn
ID: 39645314
>Can a select statement (or function) be created that will only ever return the not null value?
Sure.  

Something like this if we're talking 'all columns must be non-NULL..
SELECT yada, yada, yada
FROM your_table
WHERE (char_value IS NOT NULL AND number_value IS NOT NULL AND date_value IS NOT NULL AND blob_value IS NOT NULL)

Open in new window

0
Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

 
LVL 15

Expert Comment

by:Ess Kay
ID: 39645319
Sorry, in my comment IS NOT NULL should have spaces between them


--enjoy
0
 
LVL 34

Accepted Solution

by:
Brian Crowe earned 500 total points
ID: 39645361
SELECT CASE
   WHEN char_value IS NOT NULL THEN 'char_value'
   WHEN number_value IS NOT NULL THEN 'number_value'
   WHEN date_value IS NOT NULL THEN 'date_value'
   WHEN blob_value IS NOT NULL THEN 'blob_value'
   END AS [PopulatedValue],
COALESCE(char_value, number_value, date_value, blob_value) AS [Value]
FROM myTable
0
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 39646141
SELECT
    COALESCE(char_value, CAST(number_value AS varchar(30)), CONVERT(varchar(30), date_value, 120), CAST(blob_value AS varchar(1000))) AS Value
FROM ...
WHERE ...
0
 
LVL 65

Expert Comment

by:Jim Horn
ID: 39681311
So .. how's it going?  Lots of good comments here..
0

Featured Post

Use Case: Protecting a Hybrid Cloud Infrastructure

Microsoft Azure is rapidly becoming the norm in dynamic IT environments. This document describes the challenges that organizations face when protecting data in a hybrid cloud IT environment and presents a use case to demonstrate how Acronis Backup protects all data.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Row insertion failed. Array 5 46
SQL trigger 5 20
SQL Select in Access 2003 3 23
Substring works but need to tweak it 12 7
Slowly Changing Dimension Transformation component in data task flow is very useful for us to manage and control how data changes in SSIS.
In this article we will learn how to fix  “Cannot install SQL Server 2014 Service Pack 2: Unable to install windows installer msi file” error ?
Viewers will learn how to use the SELECT statement in SQL and will be exposed to the many uses the SELECT statement has.
Viewers will learn how to use the UPDATE and DELETE statements to change or remove existing data from their tables. Make a table: Update a specific column given a specific row using the UPDATE statement: Remove a set of values using the DELETE s…

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