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18 Questions

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Database Table Design Rules

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Questions and Answers

Which SQL command is used for data retrieval?

SELECT (correct)

INSERT

ADD

UPDATE

How are tables perceived in a relational database?

As a collection of columns

As a collection of rows (correct)

As a collection of records

As a collection of files

What SQL statement is used to create empty tables?

DEFINE TABLE

ENTER TABLE

ADD TABLE

CREATE TABLE (correct)

In interactive SQL, what happens when you type a command to ask the database a question?

The database shows you the answer right away Signup and view all the answers

Which term is used in SQL to describe the desired column features in retrieved data?

WHERE Signup and view all the answers

When constructing empty tables, when is data entered?

Data is entered after using INSERT statement Signup and view all the answers

What is the main purpose of a primary key in a database table?

To uniquely identify all table records Signup and view all the answers

Which SQL operation is used to retrieve data from a database table?

SELECT Signup and view all the answers

What happens when a primary key column contains null values?

It violates the primary key constraint Signup and view all the answers

What defines a composite key in a database table?

It consists of more than one column Signup and view all the answers

Which SQL command is used to add a new row into a table?

INSERT Signup and view all the answers

What is the range of values for the SMALLINT data type in SQL?

-32768 to 32767 Signup and view all the answers

What operation in SQL allows you to select data from two or more tables?

JOIN Signup and view all the answers

In a CROSS JOIN operation in SQL, what is the result?

Producing the Cartesian product of the tables Signup and view all the answers

What does an INNER JOIN in SQL do?

Combine tables based on a common column. Signup and view all the answers

What is the purpose of a RIGHT OUTER JOIN in SQL?

Retrieve all records from the right table and matching records from the left table. Signup and view all the answers

What does a SELF JOIN in SQL involve?

Joining a table to itself. Signup and view all the answers

Which SQL operation is used to handle database queries, updates, and maintenance?