[askdba] Re: solution needed
- From: "Justin Cave (DDBC)" <jcave@xxxxxxxxxxx>
- To: <askdba@xxxxxxxxxxxxx>
- Date: Thu, 23 Sep 2004 23:49:38 -0600
Hopefully you would not actually want to do this in production, since it
implies a rather poor design, but
SELECT *
FROM (SELECT b.*, row_number() OVER (ORDER BY customer_id) rn
FROM books)
WHERE MOD(rn,3) =3D 1
Justin Cave
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC
-----Original Message-----
From: askdba-bounce@xxxxxxxxxxxxx [mailto:askdba-bounce@xxxxxxxxxxxxx]
On Behalf Of Soumya K. Mishra
Sent: Thursday, September 23, 2004 11:13 PM
To: askdba@xxxxxxxxxxxxx
Subject: [askdba] solution needed
Q1) Below given is a simple table with Customer_id and Book_Name as 2
fields. Analyzing the book name we can see that every third book is a
book on database technology. I want to design a query to retrieve the
1st record, the 4th ,the 7th and the 10th.
And generalize it to n no of rows i.e retrieve every nth record. Please
suggest solution.
=20
=20
Customer_id=20
Book_Name
001
Mastering oracle sql
002
Microbiology for beginners
003
Algebra by Hall n Night
004
Inside of SQL Server
005
Economics by M.L Seth
006
Modern India History
007
DB2 for programmers
008
Universe in a Nutshell Stephen Hawking
009
Mutation by Robin Cook
010
Oracle 9i database administration fundamentals 1
=20
Q2) I was asked in an interview a proposed solution for the following
problem:
=20
Interviewer: The order management department manager faces the following
problem in the subsequent module of SAP ERP package-
Each time he makes an update of the latest order, it takes quite a lot
time to be reflected in the different module of that ERP solution. What
is that as a DBA you can check for it?
=20
I need to know in which field the DBA should put his concentration:
=20
Application programming: should go for the tuning of the queries, procs,
indexes, packages that the ERP application uses.
=20
Core DBA: should he go for managing the data dictionary, the buffer
cache , the table spaces for the user etc.
=20
System Administration: should he suggest for configuring the controller
set up?
Ex: change the RAID set up from 15 to 01...
=20
Thanks=20
=20
Soumya Mishra.
=20
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