JavaWeb
Chapter 1 DQL operation (important)
Today's content
DQL_sort query
DQL_ aggregate function
DQL_Group query
DQL_Paging query
Chapter 2 Usage Constraints (Important)
Constraints_Overview
Constraints_Non-Null Constraints_Unique
Constraints_Primary
Key Constraints_Primary
Key Constraints_Automatic Growth
Constraints_Foreign Key Constraints_Foreign
Key Constraints_Cascade Operation
Chapter Three Understanding Multi-Table Relationships (Important)
Introduction to
multi-table relationships Multi-table relationships_One-to-many relationship to achieve
multi-table relationship_Many-to-many relationship to achieve
multi-table relationship_One-to-one relationship to achieve
multi-table relationship_Case
Chapter 4 Three Paradigms of Database (Understanding)
Paradigm overview
Detailed explanation of the three paradigms
Chapter V Database Backup and Restore (Important)
Database backup and restore