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Questions and Answers

Which DDL command is used to change the structure of an existing database object?

ALTER (correct)

TRUNCATE

CREATE

DROP

What does the TRUNCATE command do in SQL?

Removes all records but keeps the table structure (correct)

Changes the name of a table

Adds a new column to a table

Deletes the table and its structure

Which command would you use to completely remove a database?

CREATE

RENAME

DROP (correct)

ALTER

What is the primary use of the CREATE INDEX command?

To create an index that allows duplicate values Signup and view all the answers

If you want to rename a table in SQL, which command would you use?

RENAME Signup and view all the answers

What is the purpose of the DROP command in SQL?

To delete an entire table, view, or index Signup and view all the answers

Which of the following commands can be used to modify the data type of an existing column in a table?

ALTER Signup and view all the answers

What is the result of executing the command 'DROP TABLE Students'?

The table 'Students' is permanently removed from the database Signup and view all the answers

What best describes a schema in SQL?

An authorization identifier along with descriptors for elements. Signup and view all the answers

Which data type would be most appropriate for storing a true/false value in SQL?

BOOLEAN Signup and view all the answers

What is a primary key constraint?

A value that cannot be duplicated. Signup and view all the answers

How is the DATE type in SQL typically formatted?

YYYY-MM-DD Signup and view all the answers

What does the FOREIGN KEY clause ensure in SQL?

A foreign key must reference an existing primary key. Signup and view all the answers

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Questions and Answers

Which DDL command is used to change the structure of an existing database object?

What does the TRUNCATE command do in SQL?

Which command would you use to completely remove a database?

What is the primary use of the CREATE INDEX command?

If you want to rename a table in SQL, which command would you use?

What is the purpose of the DROP command in SQL?

Which of the following commands can be used to modify the data type of an existing column in a table?

What is the result of executing the command 'DROP TABLE Students'?

What best describes a schema in SQL?

Which data type would be most appropriate for storing a true/false value in SQL?

What is a primary key constraint?

How is the DATE type in SQL typically formatted?

What does the FOREIGN KEY clause ensure in SQL?

Which data type allows for storing both date and time information in SQL?

What does the UNIQUE clause in SQL do?

What is the purpose of the semicolon in SQL commands?

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