aurelian_07
Exemplar
Top 2.2%
Member Nº 1895
Joined Jun 2026
SQL
Common Table Expressions
Storage Optimization
Approximate Aggregates
Spark
Window Deduplication
Exploding Arrays
Regex Functions
Data Modeling
Self-Referential
Many-to-Many
One-to-One
Learned
SQL163
Python2
Milestones
7-day streak
1,114 runs in the past 26 weeksActive days: 20 · Max streak: 10
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Recent solves
Show each product's product_name, rating, and the result of converting any 0 rating to NULL using NU
SQL · medium · lesson
Count the number of users whose email is either NULL or an empty string.
SQL · medium · lesson
From products, return the top 3 categories by average price
SQL · medium · lesson
From products, return category, COUNT(*) AS total, and SUM(CASE WHEN rating >= 4 THEN 1 ELSE 0 END)
SQL · medium · lesson
From products, return category and the distinct count of in_stock values per category as stock_varia
SQL · medium · lesson
For each department in employee_metrics, calculate the average metric_value and the median metric_va
SQL · medium · lesson
Calculate the median transaction amount (50th percentile) and the 95th percentile transaction amount
SQL · medium · lesson
For each product category, show total_revenue and num_transactions, ordered by total_revenue descend
SQL · medium · lesson
Find the top 3 users by total spending, ordered from highest to lowest.
SQL · medium · lesson
For each cloud provider, estimate the number of distinct service names using APPROX_DISTINCT.
SQL · medium · lesson