MySQL Table Management Quiz

Modifying and managing database tables is an essential skill when working with MySQL. This quiz will test your knowledge of key concepts such as altering table structures, adding and deleting columns, renaming tables, and duplicating data. You will also explore how to safely modify table data while preserving constraints and avoiding errors. Answer the following questions to assess your understanding of updating and managing MySQL tables effectively.

What happens to constraints like PRIMARY KEY when duplicating a table using the following statement?

CREATE TABLE new_table AS SELECT * FROM old_table;

Only primary keys are preserved

Constraints are preserved

Indexes but not primary keys are copied

Only data is copied, constraints are lost

None

What is the correct way to change a column's data type?

ALTER TABLE product MODIFY price DECIMAL(10,2);

UPDATE TABLE product SET price TYPE DECIMAL(10,2);

ALTER TABLE product CHANGE price DECIMAL(10,2);

RENAME COLUMN product.price DECIMAL(10,2);

None

Which of the following is true about MySQL table modifications?

ALTER TABLE is used to modify tables

Once a column is added, it cannot be removed

Tables cannot be modified after creation

Renaming a table deletes its data

None

If a table contains data and you attempt to shorten a column's length, what might happen?

Only new rows will be affected

The column will be shortened without issues

Data will be automatically truncated

An error will occur if data exceeds the new length

None

How can you duplicate a table in MySQL without copying its data?

CREATE TABLE new_table LIKE old_table;

DUPLICATE TABLE old_table AS new_table;

CREATE TABLE new_table AS SELECT * FROM old_table;

COPY TABLE old_table TO new_table;

None

What will the following SQL command do?

 ALTER TABLE product ADD on_sale BOOL;

Modify an existing column named ‘on_sale’

Rename the table to ‘on_sale’

Add a new column named ‘on_sale’ with a boolean data type

Delete the ‘on_sale’ column

None

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

ADD

MODIFY

NEW COLUMN

INSERT

None

Which SQL statement permanently removes a table from the database?

REMOVE TABLE

DROP TABLE

TRUNCATE TABLE

DELETE TABLE

None

Which statement ensures that the duplicated table retains its structure, including constraints?

COPY TABLE old_table TO new_table;

CREATE TABLE new_table LIKE old_table; INSERT INTO new_table SELECT * FROM old_table;

BACKUP TABLE old_table TO new_table;

CREATE TABLE new_table AS SELECT * FROM old_table;

None

10.

What will happen if you run the following statement?

ALTER TABLE product DROP COLUMN discount;

All data in the ‘discount’ column will be cleared but the column remains

An error will occur because columns cannot be deleted

The table will be deleted

The column ‘discount’ will be removed from the ‘product’ table

None

11.

Which statement correctly copies all data from one table to another after duplicating its structure?

COPY TABLE old_table TO new_table;

INSERT INTO new_table SELECT * FROM old_table;

INSERT INTO new_table VALUES SELECT * FROM old_table;

REPLICATE TABLE old_table AS new_table;

None

12.

How can you rename a column in MySQL?

MODIFY COLUMN old_name TO new_name;

UPDATE TABLE product SET COLUMN old_name = new_name;

RENAME COLUMN product.old_name TO new_name;

ALTER TABLE product CHANGE old_name new_name data_type;

None

13.

Which keyword is used to move a column to a specific position in a table?

POSITION

FIRST or AFTER

MOVE

RELOCATE

None

14.

Which SQL statement renames an existing table?

ALTER TABLE RENAME TO

MODIFY TABLE

RENAME TABLE

CHANGE TABLE

None

15.

Which SQL statement is used to modify the structure of an existing table?

MODIFY TABLE

CHANGE TABLE

ALTER TABLE

UPDATE TABLE

None

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