Objectives
After comleting this lesson,you should be able to do the following:
- Understant the goals of course.
- Discuss the theoretical and physical aspect of arelational database.
- Identify the development environments that can be used fo this coure
- Describe the database and schema used in this course.
Course Objectives(上篇)
- Retrieve row and column data from tables with the SELECT statement
- Create reports of sorted and resticted data.
- Employ SQL functions to generate and retrieve customized data.
- Run complex queries to retrieve data from multiple tables.
- Run data manipulation language(DML) statements to update data in Oracle database 11g
- Run data definition language(DDL) statments to create and manage schema objects.
Course Objectives(下篇)
- Control database access to specific objects
- Add new users with different levels of access privileges
- Manage schema objects
- Manage objects with data dictionary views
- Maniplulate large data sets in the Oracle database by using subqueries
- Manage data in different time zones
- Write multiple-column subqueries
- Use scalar and corelated subqueries
- Use the regular expression support in SQL
Course Agenda
- Introduction
- Retrieving Data Using the SQL SELECT statement
- Restricting and Sorting Data
- Using Single-Row Functions to Customer Output
- Using Conversion Functions and Conditional Expressions
- Reporting Aggregated Data Using the Group Functions
- Displaying Data from Multiple Tables
- Using Subqueries to Solve Queries
- Using the Set Operators
- Manipulating Data
- Using DDL Statements to Create and Manage Tables
- Creating Other Schema Objects
- Controlling User Access
- Managing Schema Objects
- Managing Schema with Data Dictionary Views
- Manipulating Large Data Sets
- Managing Data in Different Time Zones
- Retrieving Data Using Subqueries
- Regular Expression Support
《Oracle Database 11g SQL》Master SQL and PL/SQL in the Oracle Database
《Oracle Essential》
Relational Database Concept
- Dr.E.F Codd proposed the relational model for database systems in 1970
- -A Relational Model of Data for large Shared Data Bank
- It is the basis for the relational database management system(RDBMS)
- The relational model consists of the following:
- -Collection of objects or relations
- -Set of operators to act on the relations
- -Data integrity for accuracy and consistency
Definition of a Relational Database
A relational database is a collection of relations or two-dimensional tables.
Entity Relationship Model
- Create an entity relationship diagram from business specification or narratives:
- Scenario:
- -"... Assign one or more employees to a department..."
- -"... Some departments do not yet have assigned employees..."
Entity Relationship Modeling Conventions
Relating Multiple Tables
- Each row of data in a table is unqiuely identified by a primary key.
- You can logically relate data from multiple tables using foreign keys.(foreign key 就是外包中的主键，在本表中引用.)