DAY4 OF SQL SERIES
SQL starts with SELECT,
SELECT tells SQL what data you want
FROM tells SQL where to get it.
Master this, and the rest becomes easier.
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DAY3 OF SQL SERIES
Before building a database, we need a plan!
Entity–Relationship Model.
Used for database design
- Focuses on:
- Entities (tables)
- Attributes (columns)
- Relationships
DAY2 OF SQL SERIES.
Before learning SQL, you must understand data models.
Network Model
- Data is connected like a graph
- A record can have multiple parents
- More flexible than hierarchical
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Day1 Of SQL Series
Understand structure before writing queries.
HIERARCHICAL DATA MODEL
- Data is arranged like a tree
- One parent → many children
- Each child has only one parent