Interview-style problems
Practice
Data-science flavored Python & SQL problems — Easy to Hard, hidden tests, your own custom input.
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Average Salary by DepartmentGroupByAggregationeasyEmployees Hired After the Changeover DateFilteringDateseasyHighest Paid EmployeeSortingAggregationeasyCount Orders per CustomerGroupByeasyTotal RevenueMergeAggregationeasyStudents Above the Honours BarFilteringeasyEmployees Missing a ManagerNull HandlingeasyProducts Under the No-Paperwork CapFilteringSortingeasyDepartments With People In ThemBasicseasyAverage GPA by MajorGroupByeasyNth Highest Salary per DepartmentGroupByRankingmediumCustomers With No OrdersMergeFilteringmediumTop Category by RevenueMergeGroupBymediumEmployees Earning Above Department AverageGroupByTransformmediumOrder Counts at the Grain Asked ForDatesGroupBymediumDays Between a Customer's First and Last OrderDatesmediumStudents Carrying Enough Different CoursesSet LogicmediumSalary Rank Within DepartmentGroupByRankingmediumRunning Total of Revenue by DateCumulativeDatesmediumAverage Grade per Course (Ignoring Missing Grades)Null HandlingAggregationmediumThe Best-Funded Teams, RankedMergeGroupByhardCustomer Spend PercentileRankingAggregationhardRevenue by Category for One City's CustomersMergeGroupByhardStudents Above Their Major's Median GPAGroupByTransformhardTop Earners in Each DepartmentGroupByRankinghard
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