Solved

Oracle SQL: how to summarize detail records into multiple header fields

Posted on 2004-09-24
4
834 Views
Last Modified: 2008-01-09
I have two tables:

Table A has the following fields
  Key
  Total1
  Total2
  Total3

Table B has the following fields
  Key
  Date
  Status

Tables A and B are joined with the field "Key". Table B has multiple records for each given value in "Key". There is a "one-to-many" relationship between A and B.

How do I accumulate values in A per the following rules?

For each record in table A
  Read all records in table B that match A.Key = B.Key
     If B.Status = "A" then increment A.Total1 by 1
     If B.Status = "B" then increment A.Total2 by 1
     If B.Status = "C" then increment A.Total3 by 1

The following shows the resulting tables

A.Key  A.Total1     A.Total2      A.Total3
AAAA      3                 2                0
BBBB       2                 1                2
CCCC      0                 0                0

B.Key  B.Date          B.Status
AAAA 01/01/2001         A
AAAA 01/02/2001         B
AAAA 01/03/2001         A
AAAA 01/04/2001         B
AAAA 01/05/2001         A
BBBB  02/01/2001         C
BBBB  02/02/2001         A
BBBB  03/01/2001         A
BBBB  04/01/2001         B
BBBB  05/01/2001         C

Can this be done with SQL?

Thanks,

Jim
0
Comment
Question by:jrollins138
  • 2
4 Comments
 
LVL 15

Accepted Solution

by:
andrewst earned 150 total points
ID: 12144440
update a set (total1, total2, total3) =
(
select sum(decode(b.status,'A',1,0))
, sum(decode(b.status,'B',1,0))
, sum(decode(b.status,'C',1,0))
from b where b.key = a.key
);
0
 
LVL 6

Assisted Solution

by:Jankovsky
Jankovsky earned 150 total points
ID: 12144457
Update A set A.Total1=NVL(A.Total1,0)+(select count(1) from B where A.KEY=B.KEY and B.STATUS='A')
 ,A.Total2=NVL(A.Total1,0)+(select count(1) from B where A.KEY=B.KEY and B.STATUS='B')
 ,A.Total3=NVL(A.Total1,0)+(select count(1) from B where A.KEY=B.KEY and B.STATUS='C')
0
 
LVL 15

Expert Comment

by:andrewst
ID: 12144554
Sorry, my previous answer overwrites ratehr than increments the totals.  SHould be:

update a set (total1, total2, total3) =
(
select a.total1+sum(decode(b.status,'A',1,0))
, a.total2+sum(decode(b.status,'B',1,0))
, a.total3+sum(decode(b.status,'C',1,0))
from b where b.key = a.key
);
0
 

Author Comment

by:jrollins138
ID: 12145042
Well done and many thanks to both of you. I've increased the points to 300 and would like to split them equally between you. I used elements from both answers to solve my problem.

0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
PL SQL Search Across Columns 4 62
Deleting Rows from an Oracle Database - Performance 19 73
PL SQL Developer 7 69
format dd/mm/yyyy parameter 16 48
Configuring and using Oracle Database Gateway for ODBC Introduction First, a brief summary of what a Database Gateway is.  A Gateway is a set of driver agents and configurations that allow an Oracle database to communicate with other platforms…
Checking the Alert Log in AWS RDS Oracle can be a pain through their user interface.  I made a script to download the Alert Log, look for errors, and email me the trace files.  In this article I'll describe what I did and share my script.
This video shows, step by step, how to configure Oracle Heterogeneous Services via the Generic Gateway Agent in order to make a connection from an Oracle session and access a remote SQL Server database table.
This video shows information on the Oracle Data Dictionary, starting with the Oracle documentation, explaining the different types of Data Dictionary views available by group and permissions as well as giving examples on how to retrieve data from th…

756 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