why use schema in database code example

Example 1: what is database schema

DATABASE SCHEMA: is a chart that shows
all the tables and how they are
related to each other.If there is no schema:
1. Oracle ===> SELECT table_name FROM user_tables;
2. MySQL ===> show tables;

Example 2: database schema in sql

DATABASE SCHEMA: is a chart that
shows all the tables and how they are
related to each other.If there is no schema:
1. Oracle ===> SELECT table_name FROM user_tables;
2. MySQL ===> show tables;

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Sql Example