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Summary
This chapter introduces the concept of data retrieval and several common data retrieval methods, measures the efficiency of several retrieval methods from the perspective of time complexity, and discusses the advantages and disadvantages of index retrieval. This chapter also details the types of ACCESS 2016 query files and their design methods.
Please think about the following questions:
1. How to understand the time complexity of query operations? How to reduce complexity?
2. What is the index? How to create an index?
3. Is it reasonable to create indexes for all fields in the database?
4. What is a multi-level index?
5. The more records contained in the query result of the query file, the larger the query file. Is this correct? why?
6. As the dynamic data set, the query result is temporarily stored in memory. Is the data transmission between it and the database in the external storage unidirectional or bidirectional?
返回《Database Technology and Programming》慕课在线视频列表
-From the beginning: Knowledge Point Puzzle of Chapter I
-1.1 Data & Data Management
--1.1.1 Data, Information and Databases
--1.1.2 Explore Data Management
-1.2 Database System
--1.2.3 Three-tier Mode of Database
-Exercise
-【Discussion: Will the database be replaced by blockchain? 】
-Knowledge Point Puzzle of Chapter Ⅱ
-2.1 Database Design
-2.2 Conceptual Structure Design
--2.2.1 Conceptual Structure Design
-2.3 Logical Structure Design
--2.3.1 Logical Structure Design
--2.3.2 Integrity Rules of Relational Model
--2.3.3 Transforming ER Model into Relational Model
-Exercise
-【Discussion: Structured data —— Relational model, Unstructured data——? 】
-Knowledge Point Puzzle of Chapter Ⅲ
-3.1 Create Databases
-3.2 Create Tables
-3.3 Maintain Tables
-Exercise
-【Discussion: What is the referential integrity?】
-Knowledge Point Puzzle of Chapter Ⅳ
-4.1 Data Types, Constants and Variables
--4.1.1 Data Types, Constants and Variables
-4.2 Expressions
--4.2.1 Numeric & Character Expressions
--4.2.2 Relational & Logical Expressions, Operation Priority
-4.3 Functions
--4.3.3 Date/Time, Conversion and Iif Functions
-Exercise
-Knowledge Point Puzzle of Chapter Ⅴ
-5.1 Query and Query Files
--5.1.1 Data Retrieval Method and Query Files
-5.2 Select Query
-5.3 Operation Query
-Exercise
-Knowledge Point Puzzle of Chapter Ⅵ
-6.1 Summary Of SQL
-6.2 Data Definition Language
--6.2.1 SQL Definition Language
-6.3 Data Query Language
-6.4 Data Manipulation Language
--6.4.1 SQL Manipulation Language
-Exerise
-Knowledge Point Puzzle of Chapter Ⅶ
-7.1 Form Design
-7.2 Report Design
--7.2.1 Report Structure and Create Report
-Exercise
-Knowledge Point Puzzle of Chapter Ⅷ
-8.1 VBA Programming
--8.1.1 VBA Programming Environment
-8.2 Sequence Structure
-8.3 Selection Structure
--8.3.2 The “Select Case” Statement & Nested Selection Structure
-8.4 Repetition Structure
--8.4.2 The “Do While” Statement
-8.5 Functions & Procedures
--8.5.1 Functions and Procedures
--8.5.2 Parameter Transmission
-8.6 VBA Debug
-8.7 Arrays
-Exercise
-Knowledge Point Puzzle of Chapter Ⅸ
-9.1 What is OOP?
-9.2 Properties, Methods and Events
--9.2.1 Properties, Methods and Events
--9.2.2 Event Trigger Sequence
-9.3 OOP Examples
--9.3.1 Object Synchronization
--9.3.4 Connect and Access Tables
-Exercise
-Knowledge Point Puzzle of Chapter Ⅹ
-10.1 What is a Macro?
--10.1.2 Commands and Classifications of Macro
-10.2 Create Macros
--10.2.1 Add New Action to a Macro
-10.3 Debugging and Conversion of Macro
--10.3.1 Debugging and Conversion of Macro
-Exercise
-Congradulations!Puzzle complete!
-11.1 Requirement Analysis of Database Application System
--11.1.1 System Design Process
--11.1.2 System Function Introduction
-11.2 Data Layer of Database Application System
--11.2.1 Underlying Data Structure
-11.3 Realization of Database Application System
--11.3.1 Registration and Login Module
--11.3.2 Get User Identity from Login Form
-11.4 Test and Release of Database Application System
--11.4.1 Test and Release of Database Application System
-Final Exam