SQL is still the connective tissue of every modern data stack—from cloud warehouses to mobile apps. Recruiters know it, too: employer demand for SQL skills grew 46% year-over-year, according to labour ...

select customer_id,count(order_id) as total_orders, sum(amount) as total_spend from orders group by customer_id having count(order_id) >=3 select name, price, case ...

We want to see how you improve an existing codebase under a realistic timebox — not how much boilerplate you can generate. The strongest submissions are small, focused diffs paired with clear ...