CHANGING A MYSQL TABLE STRUCTURE COMPLETE COMPREHENSIVE ACTUAL FINAL PRACTICE EXAM PREP WITH REAL WELL ELABORATED AND MOST TESTED EVALUATION 100 PRACTICE QUESTIONS AND 100% CORRECT VERIFIED ANSWERS FULLY SOLVED (BASED ON OFFICIAL IDOI OUTLINE) WITH ACCURA

CHANGING A MYSQL TABLE STRUCTURE
COMPLETE COMPREHENSIVE ACTUAL FINAL
PRACTICE EXAM PREP WITH REAL WELL
ELABORATED AND MOST TESTED EVALUATION 100
PRACTICE QUESTIONS AND 100% CORRECT
VERIFIED ANSWERS FULLY SOLVED (BASED ON
OFFICIAL IDOI OUTLINE) WITH ACCURATE
RELIABLE RATIONALES PLUS APPROVED ANSWER
KEY (100% COMPLETE SOLUTIONS) LATEST
UPDATED VERSION 2026-2027 Q&A 93% SCORE AND
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1. Which SQL statement is used to add a new
column to an existing table?
a) ALTER TABLE table_name INSERT
column_name
b) UPDATE TABLE table_name ADD
column_name
c) ALTER TABLE table_name ADD column_name
d) MODIFY TABLE table_name ADD
column_name

,c) ALTER TABLE table_name ADD column_name
The ALTER TABLE statement combined with the
ADD clause is the standard SQL command to
introduce a new column into an existing table
structure.
2. Which clause is used in conjunction with ALTER
TABLE to remove a column?
a) DELETE COLUMN
b) DROP COLUMN
c) REMOVE COLUMN
d) ERASE COLUMN
b) DROP COLUMN
DROP COLUMN is the syntax used to permanently
delete a column and its data from a table.
3. What is the command to rename an existing
column in MySQL?
a) ALTER TABLE table_name RENAME COLUMN
old_name TO new_name
b) ALTER TABLE table_name CHANGE old_name
new_name

, c) ALTER TABLE table_name MODIFY old_name
new_name
d) ALTER TABLE table_name UPDATE COLUMN
old_name TO new_name
b) ALTER TABLE table_name CHANGE old_name
new_name
The CHANGE keyword requires the old column
name and a full new column definition, including
the new name and its data type.
4. To change only the data type of a column
without renaming it, which keyword is used?
a) CHANGE
b) ALTER
c) MODIFY
d) TYPE
c) MODIFY
MODIFY is used when you want to change the
column's definition (like data type or constraints)
but keep the same column name.

, 5. Which statement will successfully add a primary
key constraint to an existing column named
'student_id'?
a) ALTER TABLE students ADD CONSTRAINT
PRIMARY KEY student_id
b) ALTER TABLE students ADD PRIMARY KEY
(student_id)
c) ALTER TABLE students SET PRIMARY KEY
(student_id)
d) ALTER TABLE students MODIFY student_id
PRIMARY KEY
b) ALTER TABLE students ADD PRIMARY KEY
(student_id)
The ADD PRIMARY KEY (column_name) syntax is
the correct way to designate an existing column as
the primary key.
6. Which command is used to remove a primary
key from a table?
a) ALTER TABLE table_name REMOVE PRIMARY
KEY