Altering Database Tables and Renaming Columns
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Questions and Answers

What is the primary purpose of altering a database table?

  • To optimize database performance
  • To create a new database table
  • To make corrections or changes to an existing table (correct)
  • To delete a database table

    • What is the syntax to rename a column in a database table?

  • ALTER TABLE table_name UPDATE old_column_name new_column_name;
  • ALTER TABLE table_name RENAME old_column_name new_column_name;
  • ALTER TABLE table_name CHANGE old_column_name new_column_name data_type; (correct)
  • ALTER TABLE table_name SET old_column_name = new_column_name;

    • What is the syntax to add a new column to a database table?

  • ALTER TABLE table_name ADD COLUMN new_column_name data_type;
  • ALTER TABLE table_name CREATE new_column_name data_type;
  • ALTER TABLE table_name ADD new_column_name data_type; (correct)
  • ALTER TABLE table_name INSERT new_column_name data_type;

    • What is the syntax to remove a column from a database table?

    <p>ALTER TABLE table_name DROP COLUMN column_name;</p> Signup and view all the answers

    What is the syntax to modify an existing column in a database table?

    <p>ALTER TABLE table_name MODIFY COLUMN column_name new_data_type;</p> Signup and view all the answers

    What is the purpose of the ALTER TABLE command?

    <p>To modify an existing database table</p> Signup and view all the answers

    Which keyword is used to rename a column in a database table?

    <p>CHANGE</p> Signup and view all the answers

    Which keyword is used to add a new column to a database table?

    <p>ADD</p> Signup and view all the answers

    Which keyword is used to remove a column from a database table?

    <p>DROP</p> Signup and view all the answers

    Which keyword is used to modify an existing column in a database table?

    <p>MODIFY</p> Signup and view all the answers

    Study Notes

    Altering a Database Table

    • Altering a database table is necessary when corrections or changes are required, such as fixing a typo in a column name, increasing the size of a column, or removing an unnecessary column.
    • The ALTER TABLE command is used to modify an existing database table.

    Renaming a Column

    • The ALTER TABLE command can be used to rename a column in a database table.
    • The syntax is ALTER TABLE table_name CHANGE old_column_name new_column_name data_type;.
    • Example: ALTER TABLE book CHANGE publisher_name publisher VARCHAR(200);

    Adding a New Column

    • The ALTER TABLE command can be used to add a new column to a database table.
    • The syntax is ALTER TABLE table_name ADD new_column_name data_type;.
    • Example: ALTER TABLE book ADD star_rating INT(1);

    Removing a Column

    • The ALTER TABLE command can be used to remove a column from a database table.
    • The syntax is ALTER TABLE table_name DROP COLUMN column_name;.
    • Example: ALTER TABLE book DROP COLUMN genre;

    Modifying an Existing Column

    • The ALTER TABLE command can be used to modify an existing column in a database table.
    • The syntax is ALTER TABLE table_name MODIFY COLUMN column_name new_data_type;.
    • Example: ALTER TABLE book MODIFY COLUMN retail_price DOUBLE(4, 2);

    Using the ALTER TABLE Command

    • The ALTER TABLE command can be used to make various changes to a database table, including renaming a column, adding a new column, removing a column, and modifying an existing column.
    • The command is used in conjunction with other keywords, such as CHANGE, ADD, DROP, and MODIFY, to specify the type of change to be made.

    Altering a Database Table

    • Altering a database table is necessary when corrections or changes are required, such as fixing a typo in a column name, increasing the size of a column, or removing an unnecessary column.
    • The ALTER TABLE command is used to modify an existing database table.

    Renaming a Column

    • The ALTER TABLE command can be used to rename a column in a database table.
    • Syntax: ALTER TABLE table_name CHANGE old_column_name new_column_name data_type;.
    • Example: renaming publisher_name to publisher with a data type of VARCHAR(200).

    Adding a New Column

    • The ALTER TABLE command can be used to add a new column to a database table.
    • Syntax: ALTER TABLE table_name ADD new_column_name data_type;.
    • Example: adding a new column star_rating with a data type of INT(1).

    Removing a Column

    • The ALTER TABLE command can be used to remove a column from a database table.
    • Syntax: ALTER TABLE table_name DROP COLUMN column_name;.
    • Example: dropping the column genre.

    Modifying an Existing Column

    • The ALTER TABLE command can be used to modify an existing column in a database table.
    • Syntax: ALTER TABLE table_name MODIFY COLUMN column_name new_data_type;.
    • Example: modifying the retail_price column to a data type of DOUBLE(4, 2).

    Using the ALTER TABLE Command

    • The ALTER TABLE command can be used to make various changes to a database table.
    • The command is used in conjunction with other keywords, such as CHANGE, ADD, DROP, and MODIFY, to specify the type of change to be made.

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    Description

    Learn about altering database tables, fixing column names, and modifying column sizes with the ALTER TABLE command. Also, understand how to rename a column in a database table.

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