Databricks Certified Data Engineer - Associate

Explanation

To notify the entire team via a messaging webhook when the number of NULL values reaches 100, the data engineer should:

1. Set up an Alert in Databricks SQL on the query that returns the number of input records containing unexpected NULL values
2. Configure the alert condition to trigger when the value reaches 100
3. Create a new webhook alert destination that points to their messaging webhook

Why option C is correct:

• Databricks SQL Alerts support webhook destinations for sending notifications to external systems
• Webhook destinations can be configured to send HTTP POST requests to any URL, including messaging platforms like Slack, Microsoft Teams, or custom webhook endpoints
• This allows the entire team to receive notifications through their existing messaging channels

Why other options are incorrect:

• A (custom template): Custom templates are for formatting alert messages, not for setting up webhook destinations
• B (email alert destination): This would send email notifications, not webhook notifications to a messaging platform
• D (one-time notifications): This refers to notification frequency, not the destination type
• E (without notifications): This would not send any notifications at all

Implementation steps:

1. In Databricks SQL, create an alert on the query monitoring NULL values
2. Set the alert condition to trigger when the result equals or exceeds 100
3. Add a new webhook destination with the messaging platform's webhook URL
4. Configure the webhook payload format as required by the messaging platform

This approach ensures real-time notifications to the entire team when data quality issues reach the threshold of 100 NULL values.