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18 Questions

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Database Table Creation Rules

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Questions and Answers

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

To combine multiple columns

To contain null values

To allow duplicate values

To uniquely identify all table records (correct)

What must be true about values in a primary key column?

They must be unique (correct)

They can be duplicated

They should combine multiple columns

They must be null

When does a primary key become a composite key?

When it allows duplicate values

When it consists of more than one column (correct)

When it doesn't uniquely identify records

When it contains null values

What is the purpose of a foreign key in SQL?

To refer to other tables Signup and view all the answers

What is the main feature of a primary key regarding null values?

It cannot contain null values 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 SQL operation is used to connect the client and server in a database system?

CONNECT Signup and view all the answers

Which SQL JOIN operation produces the cartesian product of two tables?

Cross Join Signup and view all the answers

In an SQL Inner Join, how are tables combined?

Based on a common column Signup and view all the answers

What does a RIGHT OUTER JOIN retrieve in SQL?

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

What is the purpose of the DISCONNECT statement in database operations?

To end the connection between client and server Signup and view all the answers

What command is used in SQL to retrieve data from a table?

SELECT Signup and view all the answers

In the context of SQL, what does the term 'table' refer to?

An unordered collection of rows Signup and view all the answers

Which SQL command is used to create an empty table?

CREATE TABLE Signup and view all the answers

What is the purpose of the WHERE clause in an SQL query?

To filter rows based on conditions Signup and view all the answers

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

The database shows you the answer immediately Signup and view all the answers

What does the SQL INSERT statement primarily do?

Enter data into a table Signup and view all the answers