18 Questions
What is the primary function of the CREATE statement in SQL?
Data definition
What is a collection of schemas in an SQL environment?
Catalog
What is the purpose of the schema name in the CREATE SCHEMA statement?
To specify the authorization identifier
What is the correct syntax to create a table in SQL, specifying the schema?
CREATE TABLE COMPANY.EMPLOYEE;
What is the term for a single element in a relational model?
Tuple
What is the purpose of a semicolon in SQL statements?
To end each statement
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
Which of the following data types can have a varying length in SQL?
VARCHAR and BIT VARYING
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
Which of the following is a valid numeric data type in SQL?
DOUBLE PRECISION
What is the format of the DATE data type in SQL?
YYYY-MM-DD
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
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.
What is the purpose of the CREATE TABLE command in SQL?
To create a base table and its tuples.
What is a database schema?
A set of tables and their relationships in a database.
What is the purpose of a data definition statement in SQL?
To define the structure of a table or schema.
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.
What is the purpose of the CREATE VIEW command in SQL?
To create a virtual relation in a database.
Test your understanding of SQL data definition, relational model terms, and main SQL commands. This quiz covers topics such as table, row, and column, CREATE statement, and features of the language including data manipulation, transaction control, and security specification.
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