Podcast
Questions and Answers
What is the purpose of a primary key in a database table?
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?
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 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?
What is the purpose of a foreign key in SQL?
What is the main feature of a primary key regarding null values?
What is the main feature of a primary key regarding null values?
Which SQL command is used to add a new row into a table?
Which SQL command is used to add a new row into a table?
What SQL operation is used to connect the client and server in a database system?
What SQL operation is used to connect the client and server in a database system?
Which SQL JOIN operation produces the cartesian product of two tables?
Which SQL JOIN operation produces the cartesian product of two tables?
In an SQL Inner Join, how are tables combined?
In an SQL Inner Join, how are tables combined?
What does a RIGHT OUTER JOIN retrieve in SQL?
What does a RIGHT OUTER JOIN retrieve in SQL?
What does a Self Join in SQL involve?
What does a Self Join in SQL involve?
What is the purpose of the DISCONNECT statement in database operations?
What is the purpose of the DISCONNECT statement in database operations?
What command is used in SQL to retrieve data from a table?
What command is used in SQL to retrieve data from a table?
In the context of SQL, what does the term 'table' refer to?
In the context of SQL, what does the term 'table' refer to?
Which SQL command is used to create an empty table?
Which SQL command is used to create an empty table?
What is the purpose of the WHERE clause in an SQL query?
What is the purpose of the WHERE clause in an SQL query?
In Interactive SQL, what happens when you type a command to ask the database a question?
In Interactive SQL, what happens when you type a command to ask the database a question?
What does the SQL INSERT statement primarily do?
What does the SQL INSERT statement primarily do?
Flashcards are hidden until you start studying
