Update README.md

Author: sabrineeel

README.md

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 This assignment focuses on the administration and management of an Oracle database. It is structured into several parts:
 
 1-Creation of Tablespaces and Users
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 2-Data Definition Language (DDL)
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 3-Data Manipulation Language (DML)
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 4-User Management
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 5-Data Dictionary
 
 The objective is to master user management, data manipulation, and query optimization in Oracle SQL.