Use the Right Data Types

Explanation: Selecting appropriate data types is crucial for efficient storage and performance.

• Why It Matters: Using VARCHAR2 instead of CHAR for variable-length strings saves space. For numbers, use NUMBER with precision and scale when needed. Proper types help the database optimize memory usage and improve performance during queries.
• Example: Instead of using CHAR(50) for a name, use VARCHAR2(50), which allocates only the needed space.