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Very basic SQL concepts for oracle beginners are given below

1. Introduction to Databases

2. Codd's Rules

3. Datatypes and Creating Tables

4. SELECT Statement and where condition

5. UNION [ALL], INTERSECT, MINUS Operation

6. Built-in Functions

7. Joins

8. Subqueries

SQL Questions and Answers for practice.

SQL – Queries for Practice 1
SQL – Queries for Practice 2

All DBA concepts and useful scripts are in the below link

DBA Home