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Les10
1.
Including Constraints
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Defining Constraints CREATE
TABLE [ schema .] table ( column datatype [DEFAULT expr ] [ column_constraint ], ... [ table_constraint ][,...]); CREATE TABLE employees( employee_id NUMBER(6), first_name VARCHAR2(20), ... job_id VARCHAR2(10) NOT NULL, CONSTRAINT emp_emp_id_pk PRIMARY KEY (EMPLOYEE_ID));
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The UNIQUE
Constraint EMPLOYEES UNIQUE constraint INSERT INTO … Not allowed: already exists Allowed
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The PRIMARY
KEY Constraint DEPARTMENTS PRIMARY KEY … INSERT INTO Not allowed (Null value) Not allowed (50 already exists)
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The FOREIGN
KEY Constraint DEPARTMENTS EMPLOYEES … … FOREIGN KEY INSERT INTO Not allowed ( 9 does not exist) Allowed PRIMARY KEY
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Notas do Editor
Schedule: Timing Topic 45 minutes Lecture 25 minutes Practice 70 minutes Total
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