Creating a Table from Another Table in SQL

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the purpose of the AS keyword in the CREATE TABLE command?

  • To specify the data type of the new table
  • To specify the new table name
  • To rename the original table
  • To indicate the start of the `SELECT` statement (correct)

What is the result of using SELECT * in the CREATE TABLE command?

  • The new table will have no columns
  • The new table will have only the primary key column
  • The new table will have all columns from the original table (correct)
  • The new table will have only two columns

What happens to the data and structure of a table when it is deleted?

  • The structure is preserved, but the data is removed
  • Neither the data nor structure are affected
  • Both the data and structure are removed (correct)
  • The data is preserved, but the structure is removed

What is the purpose of the DESCRIBE command?

<p>To verify the structure of a table (A)</p> Signup and view all the answers

What is the result of creating a table with a subset of columns from the original table?

<p>The new table will have the specified columns with the same data types (C)</p> Signup and view all the answers

What is the command to delete a table?

<p>DROP TABLE (D)</p> Signup and view all the answers

What happens to the data types of the columns when creating a table from another table?

<p>The data types are preserved from the original table (A)</p> Signup and view all the answers

What is the purpose of the CREATE TABLE command with a SELECT statement?

<p>To create a new table based on another table (B)</p> Signup and view all the answers

Flashcards are hidden until you start studying

Study Notes

Creating a Table from Another Table

  • To create a table based on another table, use the CREATE TABLE command followed by the new table name, AS, and a SELECT statement that specifies the columns to be copied from the original table.
  • The new table will have the same structure as the original table, including the data types of the columns.
  • The SELECT statement can specify a subset of columns or use * to copy all columns.

Example: Creating a Table with a Subset of Columns

  • To create a table with only two columns, title and author_name, from the book table, use the command: CREATE TABLE book_two AS SELECT title, author_name FROM book
  • The new table book_two will have only two columns, title and author_name, with the same data types as the original table.
  • The DESCRIBE command can be used to verify the structure of the new table.

Example: Creating a Table with All Columns

  • To create a table with all columns from the book table, use the command: CREATE TABLE book_three AS SELECT * FROM book
  • The new table book_three will have the same structure as the original table, including all columns and data types.

Deleting a Table

  • To delete a table, use the DROP TABLE command followed by the table name.
  • The table will be removed from the database, along with all its data and structure.

Creating a Table from Another Table

  • Create a table based on another table using the CREATE TABLE command followed by the new table name, AS, and a SELECT statement.
  • The new table has the same structure as the original table, including column data types.

Specifying Columns

  • Use a SELECT statement to specify columns to copy from the original table.
  • Specify a subset of columns or use * to copy all columns.

Example: Creating a Table with a Subset of Columns

  • Create a table with a subset of columns using a SELECT statement with specified column names (e.g., title and author_name).
  • The new table will have only the specified columns with the same data types as the original table.

Example: Creating a Table with All Columns

  • Create a table with all columns using a SELECT statement with *.
  • The new table will have the same structure as the original table, including all columns and data types.

Deleting a Table

  • Delete a table using the DROP TABLE command followed by the table name.
  • The table will be removed from the database, along with all its data and structure.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

More Like This

Use Quizgecko on...
Browser
Open
Browser
Browser