SQL Fundamentals

Make the database answer the question you actually asked: filtering, grouping, NULL, keys, constraints, and transactions.

0 / 13 solved

Question Tags Difficulty Success

SQL

Easy 77%

Basics

Easy 61%

Basics

Medium 83%

Basics

Medium 89%

Basics

Medium 64%

null-semanticsaggregates +1

Medium —

clause-orderhaving +1

Medium —

Basics

Medium 15%

Basics

Medium 84%

Basics

Medium 77%

filter-clausehaving +1

Medium —

conditional-aggregationnull-semantics +1

Medium —

explainquery-plans +1

Medium —

13 of 13 questions here are still unsolved.