Solved

SQL Code to flatten out records

Posted on 2009-04-02
6
529 Views
Last Modified: 2013-11-25
I have a table sitting in SQL Server. I have a need to "flatten out" a table.  Here is my basic table

Date            Person      Prize1      Prize2      Prize3
1/1/2009 11:01:02      Bill      Item1      Item2      Item3
1/1/2009 11:05:23      Bill      Item4      NULL      NULL
I need to manipulate the data so Bill is just one record. A 4th field would need to be added to the output. I dont care about the timestamp. The new record would just have a value of 1/1/2009.  Would need sql code to do this.

Result set would be:
Date             Person    Prize1     Prize2   Prize3   Prize4
1/1/2009      Bill           Item1       Item2     Item3     Item4
0
Comment
Question by:d1cjm1ex
  • 3
  • 2
6 Comments
 
LVL 31

Expert Comment

by:RiteshShah
ID: 24051282
what if second record also have prize1,2 and 3 along with 4, should first record need to be overwritten?
0
 
LVL 69

Accepted Solution

by:
Scott Pletcher earned 500 total points
ID: 24051606
SELECT Person, CONVERT(CHAR(8), Date, 112),
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize1 ELSE '' END) AS Prize1,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize2 ELSE '' END) AS Prize2,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize3 ELSE '' END) AS Prize3,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN '' ELSE Prize1 END) AS Prize4
FROM tablename
GROUP BY Person, CONVERT(CHAR(8), Date, 112)
0
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 24051649
CORRECTION: Forgot to put the day back into a date format:


SELECT Person, CAST(CONVERT(CHAR(8), Date, 112) AS DATETIME) AS Date,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize1 ELSE '' END) AS Prize1,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize2 ELSE '' END) AS Prize2,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN Prize3 ELSE '' END) AS Prize3,
    MAX(CASE WHEN Prize2 IS NOT NULL THEN '' ELSE Prize1 END) AS Prize4
FROM tablename
GROUP BY Person, CAST(CONVERT(CHAR(8), Date, 112) AS DATETIME)
0
NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

 

Author Comment

by:d1cjm1ex
ID: 24051907
The first record should not be overwritten.  Additional columns would need to be added to the output to include all prizes.
0
 

Author Comment

by:d1cjm1ex
ID: 24053983
Your solution does create the result set I gave as an example, however I guess I should have been a bit clearer....I need this to be a bit more dynamic in that the NULL values in the second record could contain actual values (Prize 6, etc).  If I add the value "Item6" in the second record for the Prize2 column, the result set is no longer correct.

For a given day for a given person, I need to create one record that has all the Prize values. Each record can have a max of 3 prizes.  The second (or third or fourth)  record may only have one prize value or it could have 2 or 3.
0
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 24060190
Ooh, yeah, I misunderstood -- that requirement's going to be considerably more complicated :-) .
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Need help with T-SQL on SQL Server 2014 9 37
Database Integrity 1 49
AD and SQL Server 2016 2 28
Need return values from a stored procedure 8 19
Introduction SQL Server Integration Services can read XML files, that’s known by every BI developer.  (If you didn’t, don’t worry, I’m aiming this article at newcomers as well.) But how far can you go?  When does the XML Source component become …
Whether you've completed a degree in computer sciences or you're a self-taught programmer, writing your first lines of code in the real world is always a challenge. Here are some of the most common pitfalls for new programmers.
Using examples as well as descriptions, and references to Books Online, show the documentation available for datatypes, explain the available data types and show how data can be passed into and out of variables.
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…

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