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Unit 6 SQL: Data Definition Language A nd Data Control Language For Relational Databases

Unit 6 SQL: Data Definition Language A nd Data Control Language For Relational Databases

Unit 6 SQL: Data Definition Language A nd Data Control Language For Relational Databases. DDL (and DCL) in Context. The Tables To Be Defined And Some More. This is the database we will define We do not pay attention to domains of attributes as there is not much interesting in this.

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982 views • 80 slides
Creating Tables, Defining Constraints

Creating Tables, Defining Constraints

Creating Tables, Defining Constraints. Rose-Hulman Institute of Technology Curt Clifton. Outline. Data Types Creating and Altering Tables Constraints Primary and Foreign Key Constraints Row and Tuple Checks Generating Column Values Generating Scripts. Data Types.

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423 views • 40 slides
Database Principles

Database Principles

Database Principles. College of Computer Science and Technology Chongqing University of Posts & Telecom. Chapter 6 Constraints. Foreign Keys Constraints. Constraints. A constraint is a relationship among data elements that the DBMS is required to enforce. Example: key constraints.

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439 views • 32 slides
Chapter 6 Constraints

Chapter 6 Constraints

Chapter 6 Constraints. Foreign Keys Constraints. Constraints. A constraint is a relationship among data elements that the DBMS is required to enforce. Example: key constraints. Kinds of Constraints. Keys. Foreign-key, or referential-integrity. Value-based constraints.

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503 views • 31 slides
Chapter 8 Part 1

Chapter 8 Part 1

Chapter 8 Part 1. SQL-99 Schema Definition, Constraints, Queries, and Views. Chapter Outline. SQL Data Definition and Data Type Schema and catalog concepts in SQL The CREATE TABLE command in SQL Attribute data types and domains in SQL Specifying Constraints in SQL

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291 views • 19 slides
REFERENTIAL INTEGRITY

REFERENTIAL INTEGRITY

REFERENTIAL INTEGRITY. CREATE TABLE EMP (ENAME VARCHAR(30) NOT NULL, ESSN CHAR(9), BDATE DATE, DNO INTEGER DEFAULT 1, SUPERSSN CHAR(9), PRIMARY KEY (ESSN), FOREIGN KEY (DNO) REFERENCES DEPT(Dnm) ON DELETE SET DEFAULT

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137 views • 2 slides

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