|
|
Count Orders Per Customer
Free
|
Easy
|
SQL
|
|
group-by
|
|
|
Extract Year and Month from Date
Pro
|
Easy
|
SQL
|
|
date-functions
|
|
|
Filter with LIKE Pattern
Free
|
Easy
|
SQL
|
|
string-functions
|
|
|
Group By and Aggregate
Pro
|
Easy
|
Python
|
|
pandas
|
|
|
Silhouette Score Interpretation
Pro
|
Easy
|
Conceptual
|
|
machine-learning
|
|
Unlock all 23+ problems
|
|
|
String Length and Substring
Pro
|
Easy
|
SQL
|
|
string-functions
|
|
|
Subscription Renewal Dates
Pro
|
Easy
|
SQL
|
|
date-functions
|
|
|
Sum and Average by Category
Pro
|
Easy
|
SQL
|
|
group-by
|
|
|
Survey Design Principles
Pro
|
Easy
|
Conceptual
|
|
business-skills
|
|
|
Apply Transform to Column
Pro
|
Medium
|
Python
|
|
pandas
|
|
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|
|
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Choosing Business Metrics
Pro
|
Medium
|
Conceptual
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|
practical-experience
|
|
|
Date Difference for Age Calculation
Pro
|
Medium
|
SQL
|
|
date-functions
|
|
|
Experiment Design for Feature Launch
Pro
|
Medium
|
Conceptual
|
|
business-skills
|
|
|
Group by Day of Week
Pro
|
Medium
|
SQL
|
|
date-functions
|
|
|
Group By with HAVING on MIN/MAX
Pro
|
Medium
|
SQL
|
|
group-by
|
|
Unlock all 23+ problems
|
|
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Market Basket Analysis
Pro
|
Medium
|
Conceptual
|
|
business-skills
|
|
|
Model Deployment with Containers
Pro
|
Medium
|
Conceptual
|
|
practical-experience
|
|
|
Multiple Aggregations with HAVING
Pro
|
Medium
|
SQL
|
|
group-by
|
|
|
String Aggregation and Grouping
Pro
|
Medium
|
SQL
|
|
string-functions
|
|
|
Weekday vs Weekend Orders
Pro
|
Medium
|
SQL
|
|
date-functions
|
|
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|
|
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Grouping with Rollup-style Totals
Pro
|
Hard
|
SQL
|
|
group-by
|
|
|
North Star Metric Selection
Pro
|
Hard
|
Conceptual
|
|
business-skills
|
|
|
Windowed Aggregation
Pro
|
Hard
|
Python
|
|
pandas
|