Data marketplace and listings in Snowflake - Mini Project: Build & Apply

Data Marketplace and Listings in Snowflake

📖 Scenario: You are working as a cloud data engineer. Your company wants to create a simple data marketplace listing using Snowflake. This marketplace will show available datasets with their names and descriptions.Think of it like a small online store, but instead of products, you list datasets that others can use.

🎯 Goal: Build a Snowflake table to hold marketplace listings with dataset names and descriptions. Then, create a view to show only active listings.

📋 What You'll Learn

Create a table named marketplace_listings with columns dataset_name (string), description (string), and is_active (boolean).

Insert exactly three listings with given dataset names, descriptions, and active status.

Create a variable active_status set to true to filter active listings.

Create a view named active_marketplace_listings that selects only listings where is_active matches active_status.

💡 Why This Matters

🌍 Real World

Data marketplaces help organizations share and discover datasets easily in cloud platforms like Snowflake.

💼 Career

Cloud data engineers and architects often build and manage data catalogs and marketplaces to enable data sharing and governance.

1

Create the marketplace listings table

Create a table called marketplace_listings with columns dataset_name as VARCHAR, description as VARCHAR, and is_active as BOOLEAN.

Snowflake

-- Your code here to create the table

Hint

Use CREATE OR REPLACE TABLE with the exact column names and types.

2

Insert dataset listings

Insert three rows into marketplace_listings with these exact values:
1. 'CustomerData', 'Contains customer info', true
2. 'SalesData', 'Monthly sales records', false
3. 'ProductCatalog', 'Product details and prices', true

Snowflake

CREATE OR REPLACE TABLE marketplace_listings (
    dataset_name VARCHAR,
    description VARCHAR,
    is_active BOOLEAN
);
-- Your code here to insert the three listings

Hint

Use a single INSERT INTO statement with three value tuples.

3

Create a variable for active status

Create a variable called active_status and set it to true to represent active listings.

Snowflake

CREATE OR REPLACE TABLE marketplace_listings (
    dataset_name VARCHAR,
    description VARCHAR,
    is_active BOOLEAN
);

INSERT INTO marketplace_listings (dataset_name, description, is_active) VALUES
('CustomerData', 'Contains customer info', true),
('SalesData', 'Monthly sales records', false),
('ProductCatalog', 'Product details and prices', true);

-- Your code here to create the variable active_status

Hint

Use SET active_status = true; to create the variable.

4

Create a view for active listings

Create a view named active_marketplace_listings that selects dataset_name and description from marketplace_listings where is_active equals the variable active_status.

Snowflake

CREATE OR REPLACE TABLE marketplace_listings (
    dataset_name VARCHAR,
    description VARCHAR,
    is_active BOOLEAN
);

INSERT INTO marketplace_listings (dataset_name, description, is_active) VALUES
('CustomerData', 'Contains customer info', true),
('SalesData', 'Monthly sales records', false),
('ProductCatalog', 'Product details and prices', true);

SET active_status = true;

-- Your code here to create the view active_marketplace_listings

Hint

Use CREATE OR REPLACE VIEW and filter with WHERE is_active = $active_status.

Practice

1. What is the primary purpose of a data marketplace in Snowflake?

easy

A. To group data listings for easy sharing and discovery

B. To store raw data files permanently

C. To run complex SQL queries faster

D. To manage user access permissions

Solution

1. Step 1: Understand the role of a data marketplace

   A data marketplace is designed to organize and share data listings so users can find and use data easily.

2. Step 2: Compare options with this purpose

   Options A, B, and D describe other Snowflake features but not the marketplace's main role.

3. Final Answer:

   To group data listings for easy sharing and discovery -> Option A

4. Quick Check:

   Marketplace = Group data listings [OK]

Hint: Marketplaces group data listings for sharing [OK]

Common Mistakes:

• Confusing marketplace with data storage
• Thinking marketplace speeds up queries
• Mixing marketplace with access control

2. Which SQL command correctly and safely creates a new data marketplace named my_marketplace in Snowflake?

easy

A. CREATE NEW MARKETPLACE my_marketplace;

B. CREATE DATA MARKETPLACE my_marketplace;

C. CREATE MARKETPLACE my_marketplace;

D. CREATE MARKETPLACE IF NOT EXISTS my_marketplace;

Solution

1. Step 1: Recall correct syntax for creating marketplace

   Snowflake uses CREATE MARKETPLACE [IF NOT EXISTS] name; to create marketplaces safely.

2. Step 2: Check each option

   CREATE MARKETPLACE my_marketplace; lacks IF NOT EXISTS and will fail if the marketplace already exists; Options B and D use invalid syntax; CREATE MARKETPLACE IF NOT EXISTS my_marketplace; is correct and safe.

3. Final Answer:

   CREATE MARKETPLACE IF NOT EXISTS my_marketplace; -> Option D

4. Quick Check:

   CREATE MARKETPLACE IF NOT EXISTS = safe creation [OK]

Hint: Use IF NOT EXISTS to avoid errors creating marketplace [OK]

Common Mistakes:

• Adding extra keywords like DATA or NEW
• Omitting IF NOT EXISTS causing errors if exists
• Using incorrect command structure

3. Given the SQL query:

SHOW LISTINGS IN MARKETPLACE my_marketplace;

What will this command do?

medium

A. Create a new listing inside my_marketplace

B. Delete all listings from my_marketplace

C. Display all data listings available in the marketplace named my_marketplace

D. Show all marketplaces in the account

Solution

1. Step 1: Understand the SHOW LISTINGS command

   This command lists all data listings inside a specified marketplace.

2. Step 2: Match command with options

   Display all data listings available in the marketplace named my_marketplace matches the command's purpose; Options A and C describe create/delete actions which SHOW does not do; Show all marketplaces in the account shows all marketplaces in the account, not listings.

3. Final Answer:

   Display all data listings available in the marketplace named my_marketplace -> Option C

4. Quick Check:

   SHOW LISTINGS = list data sets [OK]

Hint: SHOW LISTINGS lists data sets in a marketplace [OK]

Common Mistakes:

• Confusing SHOW with CREATE or DELETE
• Thinking it lists marketplaces instead of listings
• Assuming it modifies data

4. You run the command:

CREATE LISTING my_listing IN MARKETPLACE my_marketplace;

But get an error saying the marketplace does not exist. What is the most likely cause?

medium

A. The marketplace my_marketplace was not created before creating the listing

B. The listing name my_listing is invalid

C. You need to use DROP MARKETPLACE before CREATE LISTING

D. Listings cannot be created inside marketplaces

Solution

1. Step 1: Analyze the error message

   The error says the marketplace does not exist, so the system cannot find my_marketplace.

2. Step 2: Check command dependencies

   You must create the marketplace before adding listings inside it. If missing, this error occurs.

3. Final Answer:

   The marketplace my_marketplace was not created before creating the listing -> Option A

4. Quick Check:

   Create marketplace first, then listing [OK]

Hint: Create marketplace before listings to avoid errors [OK]

Common Mistakes:

• Assuming listing name causes error
• Trying to drop marketplace before listing
• Believing listings can't be inside marketplaces

5. You want to share a dataset with external users by creating a listing in a marketplace. Which sequence of commands correctly achieves this?

hard

A. CREATE LISTING my_listing; CREATE MARKETPLACE my_marketplace; GRANT USAGE ON MARKETPLACE my_marketplace TO ROLE external_role;

B. CREATE MARKETPLACE my_marketplace; CREATE LISTING my_listing IN MARKETPLACE my_marketplace; GRANT USAGE ON LISTING my_listing TO ROLE external_role;

C. CREATE MARKETPLACE my_marketplace; GRANT USAGE ON MARKETPLACE my_marketplace TO ROLE external_role; CREATE LISTING my_listing IN MARKETPLACE my_marketplace;

D. GRANT USAGE ON LISTING my_listing TO ROLE external_role; CREATE MARKETPLACE my_marketplace; CREATE LISTING my_listing IN MARKETPLACE my_marketplace;

Solution

1. Step 1: Create the marketplace first

   You must create the marketplace before adding listings inside it.

2. Step 2: Create the listing inside the marketplace

   After marketplace creation, create the listing specifying the marketplace.

3. Step 3: Grant usage on the listing to external users

   Granting usage on the listing allows external roles to access the shared data.

4. Final Answer:

   CREATE MARKETPLACE my_marketplace; CREATE LISTING my_listing IN MARKETPLACE my_marketplace; GRANT USAGE ON LISTING my_listing TO ROLE external_role; -> Option B

5. Quick Check:

   Create marketplace -> listing -> grant usage [OK]

Hint: Create marketplace, then listing, then grant access [OK]

Common Mistakes:

• Creating listing before marketplace
• Granting usage before creating listing
• Granting usage on marketplace instead of listing