• Soham Mukherjee (11/11) Nov 07 2022 I have a table with ten columns and would want to choose column 1

Soham Mukherjee <sohammm1087 gmail.com> writes:

I have a table with ten columns and would want to choose column 1 
and column 9 from it. How many columns should be selected 
internally in RDBMS? Also, I'm not an expert in 3-Level 
Architecture of DBMS to understand [data 
independence](https://www.scaler.com/topics/data-independence-in-dbms/) but
I've read several resources.

I'm asking about Oracle, but I'm also learning hbase, so I'm a 
little confused. I'm not a database guy; I'm a java guy who is 
now into Hadoop and hasn't touched a database in over a year. 
There are other reasons for this, but we will not go into them. I 
am very aware of what I am doing. I'm a newbie MR coder, but I'm 
doing okay with my part of the code.