note: database normalization

notes/databases/json_vs_jsonb_type.md

@@ -1,6 +1,6 @@
 # JSON vs JSONB in PostgreSQL
 
-<!-- published_date: 18 May, 2024 -->
+<!-- published_date: 13 May, 2024 -->
 <!-- description: JSON vs JSONB in PostgreSQL -->
 <!-- tags: database -->
 

notes/databases/normalization.md

@@ -0,0 +1,50 @@
+# Database Normalization
+
+<!-- published_date: 15 May, 2024 -->
+<!-- description: Database Normalization -->
+<!-- tags: database, normalization -->
+
+https://www.studytonight.com/dbms/database-normalization.php
+
+
+1. First Normal Form also known as 1NF
+
+2. Second Normal Form or 2NF
+
+3. Third Normal Form or 3NF
+
+4. Boyce-Codd Normal Form or BCNF
+
+5. Fourth Normal Form or 4NF
+
+6. Fifth Normal Form or 5NF or PJNF (Project-Join Normal Form)
+
+---
+
+## 1. First Normal Form (1NF)
+
+For a table to be in the First Normal Form, it should follow the following 4 rules:
+
+It should only have single(atomic) valued attributes/columns.
+
+Values stored in a column should be of the same domain.
+
+All the columns in a table should have unique names.
+
+And the order in which data is stored should not matter.
+
+## 2. Second Normal Form (2NF)
+
+For a table to be in the Second Normal Form,
+
+It should be in the First Normal form.
+
+And, it should not have *Partial Dependency*
+
+## 3. Third Normal Form (3NF)
+
+A table is said to be in the Third Normal Form when,
+
+It satisfies the First Normal Form and the Second Normal form.
+
+And, it doesn't have **Transitive Dependency**