'Check constraint' diaporamas de présentation

CMPT 354

SQL Constraints and Triggers. CMPT 354. SQL Constraints. Constraints Primary Key Foreign Key General table constraints Domain constraints Assertions Triggers. Bank ERD. Customer. Account. Branch. works. owns. holds. transacts. Transaction. Employee. osin. lname. fname. age.

705 views • 51 slides

Oracle 11g: SQL

Oracle 11g: SQL. Chapter 4 Constraints. Objectives. Explain the purpose of constraints in a table Distinguish among PRIMARY KEY, FOREIGN KEY, UNIQUE, CHECK, and NOT NULL constraints and the appropriate use for each constraint

677 views • 35 slides

Oracle 11g: SQL

Oracle 11g: SQL. Chapter 4 Constraints. Objectives. Explain the purpose of constraints in a table Distinguish among PRIMARY KEY, FOREIGN KEY, UNIQUE, CHECK, and NOT NULL constraints and the appropriate use for each constraint

395 views • 35 slides

Constraints

Constraints. Primary Key Constraint. It is derived from the entity UID or created as surrogate key. Uniqueness is enforced by an index: Index is not defined in Oracle Designer All columns in key are mandatory. It should not be updatable. Every table should have one!. Unique Key Constraint.

274 views • 20 slides

Constraints

210 views • 16 slides

Check Constraints

135 views • 8 slides