INSERT with DEFAULT values in SQL - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to insert a new row using the default values for all columns.

SQL

INSERT INTO employees [1];

Drag options to blanks, or click blank then click option'

ADEFAULT VALUES

BVALUES ()

CVALUES (DEFAULT)

DSET DEFAULT

Attempts:

3 left

💡 Hint

Common Mistakes

Using VALUES () which is invalid syntax for default insertion.

Trying to use SET DEFAULT which is not valid here.

The correct syntax to insert a row with all default values is INSERT INTO table DEFAULT VALUES;

2fill in blank

medium

Complete the code to insert a new row with default values in the 'departments' table.

SQL

INSERT INTO departments [1];

Drag options to blanks, or click blank then click option'

ADEFAULT VALUES

BVALUES ()

CSET DEFAULT

DVALUES (DEFAULT)

Attempts:

3 left

💡 Hint

Common Mistakes

Using VALUES (DEFAULT) which is invalid without specifying columns.

Using VALUES () which is not accepted for default insertion.

To insert a row with all default values, use DEFAULT VALUES after the table name.

3fill in blank

hard

Fix the error in the code to insert a default row into the 'projects' table.

SQL

INSERT INTO projects [1];

Drag options to blanks, or click blank then click option'

AVALUES (DEFAULT)

BSET DEFAULT

CDEFAULT VALUES

DVALUES ()

Attempts:

3 left

💡 Hint

Common Mistakes

Using VALUES () which is not valid syntax.

Trying to use SET DEFAULT which is not a valid clause here.

The correct syntax to insert a row with default values is INSERT INTO projects DEFAULT VALUES;. Using VALUES () causes a syntax error.

4fill in blank

hard

Fill both blanks to insert a row with default values into the 'tasks' table.

SQL

INSERT INTO [1] [2];

Drag options to blanks, or click blank then click option'

Atasks

BDEFAULT VALUES

CVALUES ()

DSET DEFAULT

Attempts:

3 left

💡 Hint

Common Mistakes

Using VALUES () instead of DEFAULT VALUES.

Using SET DEFAULT which is invalid here.

The correct syntax is INSERT INTO tasks DEFAULT VALUES; to insert a row with default values.

5fill in blank

hard

Fill all three blanks to insert a default row into the 'clients' table.

SQL

INSERT INTO [1] [2] [3];

Drag options to blanks, or click blank then click option'

Aclients

BDEFAULT

CVALUES

DVALUES ()

Attempts:

3 left

💡 Hint

Common Mistakes

Using VALUES () which is invalid for default insertion.

Splitting DEFAULT VALUES incorrectly.

The correct syntax to insert default values is INSERT INTO clients DEFAULT VALUES;. Here, the blanks represent the table name, the keyword DEFAULT, and the keyword VALUES respectively.

Practice

1. What does the SQL statement INSERT INTO table_name DEFAULT VALUES; do?

easy

A. Inserts a new row using all default values for columns

B. Deletes all rows from the table

C. Updates existing rows with default values

D. Selects all rows with default values

Solution

1. Step 1: Understand the INSERT statement

   The statement inserts a new row into the table.

2. Step 2: Recognize DEFAULT VALUES usage

   Using DEFAULT VALUES means the new row uses default values defined for each column.

3. Final Answer:

   Inserts a new row using all default values for columns -> Option A

4. Quick Check:

   INSERT ... DEFAULT VALUES inserts default row [OK]

Hint: DEFAULT VALUES inserts a row with all default column values [OK]

Common Mistakes:

• Thinking it deletes or updates rows
• Confusing DEFAULT VALUES with SELECT
• Assuming it inserts NULLs instead of defaults

2. Which of the following is the correct syntax to insert a row with default values in SQL?

easy

A. INSERT INTO table_name VALUES (DEFAULT);

B. INSERT INTO table_name VALUES DEFAULT;

C. INSERT DEFAULT INTO table_name VALUES;

D. INSERT INTO table_name DEFAULT VALUES;

Solution

1. Step 1: Recall correct syntax for default insertion

   The correct syntax is INSERT INTO table_name DEFAULT VALUES; to insert a row with all default values.

2. Step 2: Check each option

   INSERT INTO table_name DEFAULT VALUES; matches the correct syntax exactly; others are invalid or incorrect.

3. Final Answer:

   INSERT INTO table_name DEFAULT VALUES; -> Option D

4. Quick Check:

   Correct syntax = INSERT INTO ... DEFAULT VALUES [OK]

Hint: Remember: DEFAULT VALUES comes after table name in INSERT [OK]

Common Mistakes:

• Placing DEFAULT inside VALUES parentheses
• Swapping DEFAULT and VALUES keywords
• Using incorrect keyword order

3. Given the table users(id INT DEFAULT 0, name VARCHAR(20) DEFAULT 'guest'), what will be the result of INSERT INTO users DEFAULT VALUES; SELECT * FROM users; after running on an empty table?

medium

A. Empty result set

B. [{"id": 0, "name": "guest"}]

C. Syntax error

D. [{"id": NULL, "name": NULL}]

Solution

1. Step 1: Understand table defaults

   The table has default values: id = 0, name = 'guest'.

2. Step 2: Effect of INSERT DEFAULT VALUES

   Inserting default values adds a row with id=0 and name='guest'.

3. Step 3: SELECT result

   After insertion, selecting all rows returns one row with those default values.

4. Final Answer:

   [{"id": 0, "name": "guest"}] -> Option B

5. Quick Check:

   Defaults inserted row = id 0, name guest [OK]

Hint: Defaults fill columns if no values given [OK]

Common Mistakes:

• Expecting NULL instead of default values
• Assuming syntax error due to DEFAULT VALUES
• Thinking table remains empty

4. Consider the table products(id INT NOT NULL, name VARCHAR(20) DEFAULT 'unknown'). What error occurs when running INSERT INTO products DEFAULT VALUES;?

medium

A. Error: Column 'id' has no default and no value provided

B. No error, inserts row with NULL id and 'unknown' name

C. Syntax error due to DEFAULT VALUES usage

D. Inserts row with id=0 and name='unknown'

Solution

1. Step 1: Check columns for defaults

   The 'id' column has no default and is NOT nullable.

2. Step 2: Effect of INSERT DEFAULT VALUES

   Trying to insert default values fails because 'id' has no default and no value is given.

3. Final Answer:

   Error: Column 'id' has no default and no value provided -> Option A

4. Quick Check:

   Missing default for NOT NULL column causes error [OK]

Hint: All columns need defaults or allow NULL for DEFAULT VALUES [OK]

Common Mistakes:

• Assuming NULL is inserted automatically
• Thinking DEFAULT VALUES always works
• Confusing syntax error with constraint error

5. You have a table orders(order_id INT PRIMARY KEY DEFAULT nextval('order_seq'), status VARCHAR(10) DEFAULT 'pending', created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP). Which SQL statement correctly inserts a new order using all defaults except setting status to 'shipped'?

hard

A. INSERT INTO orders (order_id, status, created_at) VALUES (DEFAULT, DEFAULT, 'shipped');

B. INSERT INTO orders DEFAULT VALUES SET status = 'shipped';

C. INSERT INTO orders (status) VALUES ('shipped');

D. INSERT INTO orders (DEFAULT, 'shipped', DEFAULT);

Solution

1. Step 1: Understand default and explicit values

   We want to use defaults for order_id and created_at, but set status explicitly.

2. Step 2: Check each option

   INSERT INTO orders (status) VALUES ('shipped'); correctly lets the DBMS use defaults implicitly for unspecified columns order_id and created_at. INSERT INTO orders DEFAULT VALUES SET status = 'shipped'; is invalid syntax. INSERT INTO orders (order_id, status, created_at) VALUES (DEFAULT, DEFAULT, 'shipped'); incorrectly sets status to its default ('pending') and attempts to set created_at to 'shipped' causing a type mismatch error. INSERT INTO orders (DEFAULT, 'shipped', DEFAULT); is invalid syntax (missing VALUES keyword).

3. Final Answer:

   INSERT INTO orders (status) VALUES ('shipped'); -> Option C

4. Quick Check:

   Unspecified columns use their default values automatically [OK]

Hint: Unspecified columns in INSERT use column defaults [OK]

Common Mistakes:

• Thinking omitting columns always causes errors
• Using DEFAULT VALUES with SET syntax
• Misplacing values and DEFAULT keywords in VALUES clause