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SQL Mystery

Query the clues. Name the culprit.

A real case, a real database. Every query runs against actual SQLite, in your browser — no clue appears until your query genuinely finds it.

8 cases

MySQL Database

Master MySQL from the ground up. This comprehensive guide covers queries, joins, keys, indexes, stored procedures, transactions, and database design through 79 hands-on lessons.

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8 cases

SQL Server

Master Microsoft SQL Server and T-SQL from the ground up. This comprehensive course covers database design, T-SQL querying, joins, stored procedures, transactions, indexing, and performance tuning, then builds into security, backup/restore, and Azure SQL, through 42 hands-on lessons.

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