Graph Database 3 NoSQL 4 database 1 dynamic schema 2 Cypher Query Language 3 CRUD 1 OOD 4 Design Pattern 4 Iterator Pattern 1 Java 5 Java Generic 1 Recursion 2 Data Structure and Algorithm 3 Tree 1 Undirected Graph 1 Breath-First Search(BFS) 1 Queue 1 Dynamic programming 1 backtracking 1 Depth-first Search (DFS) 1 memorization 1 PostGIS 1 PostgreSQL 1 R-tree 1 SQL 2 Data Structure and algorithm 1 introduction 1 Software Requirements Analysis 2 MySQL Database Design 1 E-R diagram 1 Javascript 1 JSP 1 Bootstrap 1 MySQL 1 Front-end 1 Back-end 1 Database Design 1 Spring MVC 1 Complete Binary Tree 1 ZigZag 1 Math 1 Python 2 Big Data 1 sampling algorithm 1 SQL, PostgreSQL, Time-series Database, spatial databases, data storage 1 Data Structure 1 Algorithm 1 Design 1 Observer Pattern 1 IntelliJ IDEA 2 SpringBoot 1 OGM 1 Unit Test 1 Factory Method 1 Java Source Code 1 Abstract Factory 1 JDBC 1 Decorator Pattern 1 IO 1 InputStream 1 data visualization 1 Spark 1 ORM 1 Maven 1 XML 2 CQL 1 RDF 1 Neo4j 1 dom4j 1 java 1 Spring 1 MVC 1 Web Server 1 Gradle 1 Java reflection 1 Annotation 1 Thread 1 PostMan API 1