Finding Columns will null or empty values in Oracle Database Tables

Gather Statistics on the required list of tables.

in SQL developer go to
Connections     -   Your Connection -   Tables (filter your tables) - Right click - Statistics - Gather Statistics

Run SQL

SELECT *
FROM user_tab_columns t
WHERE
  --t.nullable = 'Y' AND
  t.table_name IN ('Table1','Table2')
AND (t.column_name LIKE '%ORG%'
OR t.column_name LIKE '%BU%')
AND t.num_distinct < 2 ;

Knowledge Base: Oracle Financials Basics

Terms:

Company

Legal entity

BU (Operating Unit)

line of business

group account

natural account

Balancing segments

GL accounts

Journal

Set of books

Chart of accounts - General Ledger - Sub Ledger (https://www.business-case-analysis.com/ledger.html#contentslist)

Invoice, payment, Return

Knowledge Base: Azure

Azure Basic Training : https://docs.microsoft.com/en-us/learn/paths/azure-fundamentals/

Knowledge Base: Oracle Autonomous datawaerehouise (ADW) ML notebook

Basic Understanding at
https://blogs.oracle.com/datamining/introducing-oracle-machine-learning-sql-notebooks-for-the-oracle-autonomous-data-warehouse-cloud

Details: https://docs.oracle.com/en/cloud/paas/autonomous-data-warehouse-cloud/user/part-using.html#GUID-F9B1D121-5D89-40B4-90C6-8E8E233C2B3F

Troubleshooting:
How to login to a given Schema in notebook
Schema/User need to be given following GRANTS/ROLES to be able to access notebook.
GRANT DWROLE to ;
GRANT OML_DEVELOPER to ;
These Roles can be given by ADMIN user. ADMIN user should connect using SQL Developer or from other client source. (ADMIN user cant run SQL from notebook)
I use a compute machine in the same OCI compartment, then create a connection to ADW.

Knowledge Base: Blockchain

To understand basic cryptocurrency blockchain concept for a beginner.
http://learnmeabitcoin.com/guide/

How is the wallet balance computed
https://bitcoin.stackexchange.com/questions/22997/how-is-a-wallets-balance-computed

https://medium.com/coinmonks/blockchain-for-beginners-what-is-blockchain-519db8c6677a