Databases

1. Scalability

2. Functions

2.1. Redundency

2.2. Inconsistency

2.3. Integrity

3. Four components

3.1. Data Definition

3.1.1. Data dictionary

3.1.1.1. Variable names

3.1.1.1.1. Each field has a name.

3.1.1.2. Business rule

3.1.1.2.1. Validation rule

3.1.1.2.2. Duplicate

3.1.1.3. Keys

3.1.1.3.1. Foreign key

3.1.1.3.2. Primary key

3.2. Data manipulation

3.2.1. Query-by-example

3.2.2. Structured query language

3.3. Data

4. Relationships

4.1. one-to-many

4.2. many-to-many

4.3. one-to-one

5. Notes

6. Performence

7. Protection

7.1. Security

8. New node