Rename operation in DBMS Theory - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding the purpose of the Rename operation

What is the main purpose of the Rename operation in a database management system?

A To copy data from one table to another

B To delete a table and all its data permanently

C To change the name of a table or column without altering its data

D To merge two tables into one

💡 Hint

Think about what happens when you want to give a table or column a new name but keep everything else the same.

The Rename operation allows changing the name of a table or column while keeping the data intact. It does not delete, copy, or merge data.

📋 Factual

intermediate

Syntax for renaming a table in SQL

Which of the following SQL commands correctly renames a table named old_table to new_table?

A RENAME TABLE old_table TO new_table;

B ALTER TABLE old_table RENAME TO new_table;

C UPDATE TABLE old_table SET NAME = 'new_table';

D CHANGE TABLE old_table NAME new_table;

💡 Hint

Look for the standard SQL command that uses ALTER TABLE and RENAME TO.

The standard SQL syntax to rename a table is ALTER TABLE old_table RENAME TO new_table;. Other options are either invalid or non-standard.

🔍 Analysis

advanced

Effect of renaming a column on queries

After renaming a column price to cost in a table, what must be done to ensure existing queries continue to work correctly?

A Update all queries to use the new column name <code>cost</code> instead of <code>price</code>

B No changes are needed; queries will automatically recognize the new name

C Drop and recreate the table to refresh the schema

D Rename the table as well to reflect the column name change

💡 Hint

Think about how queries refer to columns by name.

Queries use column names explicitly. After renaming a column, queries must be updated to use the new name; otherwise, they will fail.

❓ Comparison

advanced

Difference between renaming a table and copying a table

Which statement correctly describes the difference between renaming a table and copying a table in a database?

A Renaming changes the table's name without duplicating data; copying creates a new table with the same data

B Both renaming and copying create a new table with the same name

C Renaming duplicates the table and deletes the original; copying only changes the name

D Renaming deletes the table; copying merges two tables

💡 Hint

Consider what happens to the original table and data in each operation.

Renaming changes the table's name but keeps the same table and data. Copying creates a new table with the same data, leaving the original unchanged.

❓ Reasoning

expert

Impact of renaming a table on database constraints and references

If a table employees is renamed to staff, what must be considered to maintain database integrity?

A Update all foreign key references and constraints that point to <code>employees</code> to use <code>staff</code>

B Rename all columns in the table to match the new table name

C Drop all constraints before renaming and recreate them after

D No action is needed because constraints automatically update with the table rename

💡 Hint

Constraints and foreign keys reference the table object internally by identifier, not by name.

Foreign keys and other constraints reference the table object by its internal identifier, not explicitly by name. Renaming the table automatically maintains these references, preserving database integrity without manual updates.