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Exam (elaborations)

SER 322 PRACTICE TEST

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  • SER 322
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  • SER 322

SER 322 PRACTICE TEST.,...

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  • November 8, 2024
  • 2
  • 2024/2025
  • Exam (elaborations)
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  • SER 322
  • SER 322
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SER 322 PRACTICE TEST

Terminology for SQL - ANSWER Table, Row, Column

Main SQL Command for Data Definition - ANSWER CREATE

Create a schema statement called company with an authorized user
Jsmith - ANSWER CREATE SCHEME COMPANY AUTHORIZATION
'Jsmith';

Create a table called Employee from the company schema - ANSWER
CREATE TABLE COMPANY.EMPLOYEE or CREATE TABLE
EMPLOYEE

Base tables (base relations) - ANSWER Relation and its tuples are
actually created and stored as a file by the DBMS

Virtual relations (views) - ANSWER Created through the CREATE
VIEW statement. Do not correspond to any physical file.

In Table schema all primary keys have to be NOT NULL - ANSWER
TRUE

UNQUE (attribute) is used for - ANSWER Candidate Keys

Create a foreign key for Mgr_Ssn that useds Ssn from another table
called EMPLOYER - ANSWER PRIMARY KEY (Mgr_Ssn)
REFERENCES EMPLOYEE(Ssn));

SQL datatypes: Integer numbers: - ANSWER INTEGER, INT &
SMALLINT

FLOATING_POINT real numbers: - ANSWER FLOAT, REAL and
DOUBLE PRECISION

Character & string: - ANSWER CHAR(n), CHARACTER(n),
VARCHAR(n), CHAR VARYING, CHARACTER VARYING(N)

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