Keentune
Adaptive skill practice — find your level, get sharper.

SQL practice

Predict query results — and learn why
Master SQL by predicting what queries return — SELECT and WHERE filtering, JOINs, GROUP BY with aggregates (COUNT/SUM/AVG/MIN/MAX), HAVING, ORDER BY and LIMIT, DISTINCT, and the NULL semantics that trip people up (= NULL vs IS NULL, COUNT(col) vs COUNT(*)). Every answer is computed by running real SQLite, so the explanations are exact. Output-prediction practice that builds genuine query fluency for interviews. Part of the Developer track.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
New here? Read the SQL guide
A free 17-minute primer — the mental model, the mistakes beginners make, and what to practise first.
Curriculum
323 concepts across 32 chapters, from foundations through advanced practice — each one a concept the adaptive question bank can teach and test.
A. The relational model and what a query is
11
B. NULL and the three-valued logic that follows
10
C. Filtering with WHERE
10
D. Sorting, paging and DISTINCT
12
E. Aggregation and grouping
11
F. Joins
12
G. Subqueries and CTEs
10
H. Window functions
13
I. Set operations
10
J. Data types
16
K. Expressions and functions
10
L. Modifying data
10
M. Constraints and integrity
14
N. Indexes
15
O. Transactions and concurrency
16
P. Query planning and performance
16
Q. Security
16
R. Schema design and normalization
10
S. JSON and semi-structured data
13
T. Views, functions and procedural extensions
11
U. Dialect differences and portability
14
V. Full-text search
6
W. Arrays
5
X. Dates, times and time zones
7
Y. Sequences, identity and generated keys
5
Z. Partitioning and inheritance
6
AA. Locking, blocking and retry
6
AB. MVCC, physical storage and vacuum
7
AC. Server-side routines and error handling
7
AD. Sessions, connections and server settings
5
AE. Backup, restore and replication
5
AF. Extensions and foreign data
4
View the full curriculum →
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