FreePremium87 ProblemsSQL
SQL Subqueries & CTE Practice with Built-In Visualizer
Build fluency with scalar subqueries, correlated subqueries, EXISTS/NOT EXISTS, IN/NOT IN, and Common Table Expressions (CTEs). The built-in SQL Visualizer walks you through CTE execution order, showing intermediate result sets so you can debug complex multi-step queries.
87
SQL Problems
Difficulty Breakdown
87 problems5 Easy(6%)
24 Medium(28%)
54 Hard(62%)
4 Expert(5%)
Skills You'll Practice
81 skillsadtechaggregationanti joinanti patternavgbankingcase whenclassificationcleaning transformcoalescecomparisoncompliancecomputed columnconditional aggregationcorrelated subquerycountcount distinctctectesdate timederived columnderived tabledistinctexistsfilteringfintechfood deliveryfour table joingroup byhavinghealthcarein subqueryinner joinjoinjoinsjuliandayleft joinloan servicinglodginglogisticsmaxmobilitymulti ctemulti joinmulti stepmulti tablemulti table joinnot existsnot innullifnumeric thresholdpartition bypaymentspercentagerankreal estateretailriskroasroundrow numbersaasscalar subqueryscorecardself joinsingle tablesocialsortingstreamingsubquerysumtelecomthree table jointie breakerstop 1 per grouptop ntwo table joinwherewhere clausewindow fnswindow function
All Problems87 total
Explore more topics
Practice with 1,500+ problems across SQL and Python — window functions, joins, pandas, and more.
All company names, logos, and trademarks are the property of their respective owners.
Their use is for identification purposes only and does not imply endorsement.