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Navathe Slide 6-4: SQL Data Definition and Terminology

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Navathe Slide 6-4: SQL Data Definition and Terminology

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Questions and Answers

What is the primary function of the CREATE statement in SQL?

Security specification

Data definition (correct)

Data manipulation

Transaction control

What is a collection of schemas in an SQL environment?

Schema

Cluster

Catalog (correct)

Relation

What is the purpose of the schema name in the CREATE SCHEMA statement?

To specify the database name

To specify the attribute name

To specify the table name

To specify the authorization identifier (correct)

What is the correct syntax to create a table in SQL, specifying the schema?

CREATE TABLE COMPANY.EMPLOYEE; Signup and view all the answers

What is the term for a single element in a relational model?

Tuple Signup and view all the answers

What is the purpose of a semicolon in SQL statements?

To end each statement Signup and view all the answers

What is the purpose of the INTERVAL data type in SQL?

To specify a relative value for incrementing or decrementing a date, time, or timestamp Signup and view all the answers

Which of the following data types can have a varying length in SQL?

VARCHAR and BIT VARYING Signup and view all the answers

What is the main difference between CHAR and VARCHAR data types in SQL?

CHAR is used for fixed-length character strings, while VARCHAR is used for varying-length character strings Signup and view all the answers

Which of the following is a valid numeric data type in SQL?

DOUBLE PRECISION Signup and view all the answers

What is the format of the DATE data type in SQL?

YYYY-MM-DD Signup and view all the answers

What is the purpose of the TIMESTAMP data type in SQL?

To specify a date and time with a minimum of six positions for decimal fractions of seconds Signup and view all the answers

What is the primary difference between a base table and a virtual table in a relational database?

Base tables are physically stored as a file, while virtual tables do not correspond to any physical file. Signup and view all the answers

What is the purpose of the CREATE TABLE command in SQL?

To create a base table and its tuples. Signup and view all the answers

What is a database schema?

A set of tables and their relationships in a database. Signup and view all the answers

What is the purpose of a data definition statement in SQL?

To define the structure of a table or schema. Signup and view all the answers

What is the difference between a database schema and a database state?

A database schema refers to the logical structure of a database, while a database state refers to a specific instance of the database at a particular point in time. Signup and view all the answers

What is the purpose of the CREATE VIEW command in SQL?

To create a virtual relation in a database. Signup and view all the answers