Podcast
Questions and Answers
What is the purpose of the SQL data-manipulation language (DML)?
What is the purpose of the SQL data-manipulation language (DML)?
- To manage user access and permissions
- To query information and manipulate data (correct)
- To create databases and tables
- To optimize database performance
What does the 'select' clause in SQL do?
What does the 'select' clause in SQL do?
- Create a new table based on the query results
- Specify the tables to be queried
- List the attributes desired in the result of a query (correct)
- Define the conditions for the query
What does the 'alter table' statement do in SQL?
What does the 'alter table' statement do in SQL?
- Deletes all contents of a table
- Optimizes the performance of a table
- Adds a new attribute to a relation (correct)
- Drops an attribute from a relation
What is the result of an SQL query?
What is the result of an SQL query?
What is the purpose of the SQL 'drop table' statement?
What is the purpose of the SQL 'drop table' statement?
SQL allows duplicates in relations as well as in query results.
SQL allows duplicates in relations as well as in query results.
The 'delete from' statement in SQL deletes the table and its contents.
The 'delete from' statement in SQL deletes the table and its contents.
The 'alter table' statement in SQL can be used to add a new attribute to a relation.
The 'alter table' statement in SQL can be used to add a new attribute to a relation.
The select clause in SQL corresponds to the selection operation of the relational algebra.
The select clause in SQL corresponds to the selection operation of the relational algebra.
SQL names are case sensitive, meaning you cannot use upper- or lower-case letters interchangeably.
SQL names are case sensitive, meaning you cannot use upper- or lower-case letters interchangeably.
SQL allows duplicates in relations as well as in query results.
SQL allows duplicates in relations as well as in query results.
The 'alter table' statement in SQL can be used to add a new attribute to a relation.
The 'alter table' statement in SQL can be used to add a new attribute to a relation.
The select clause in SQL corresponds to the projection operation of the relational algebra.
The select clause in SQL corresponds to the projection operation of the relational algebra.
SQL names are case sensitive, meaning you cannot use upper- or lower-case letters interchangeably.
SQL names are case sensitive, meaning you cannot use upper- or lower-case letters interchangeably.
The 'delete from' statement in SQL deletes all contents of the table, but retains the table.
The 'delete from' statement in SQL deletes all contents of the table, but retains the table.
