Original revision introduction and starter practice. Full learning texts are available through the publisher links below. This guide is not a CBSE-issued solution manual.
Revision introduction
A function can accept arguments and return a result. File handling distinguishes text, binary and CSV data. A relational database stores rows and columns; a primary key uniquely identifies a row. SQL SELECT retrieves data, WHERE filters rows and GROUP BY forms groups before HAVING filters them.
Curriculum navigation
Computational Thinking and Programming – II
Computer Networks
Database Management
Consult the current official syllabus for examinable sections, project-only content, practicals, prescribed texts and exclusions. A unit index does not override those boundaries.
Original practice
Which SQL clause filters groups after aggregation?
HAVING
WHERE
FROM
ORDER
Worked answer
HAVING
HAVING filters aggregated groups; WHERE filters individual rows before grouping.
Full publisher materials and answer resources
CBSE 12 Computer Science · syllabus · CBSE · 2026-27 The current official syllabus defines examinable content, internal assessment, practicals and prescribed books. Unit names in the app are a navigation index; consult this document for exclusions and assessment boundaries.
NCERT · Computer Science · NCERT · 2026-27 Official book selector with chapter PDFs and complete-book download. A textbook may contain material outside the assessed syllabus; follow the linked current syllabus.
KVS student support material · Class 12 · Kendriya Vidyalaya Sangathan · 2026-27 Use the 2026–27 support-material folders linked by the school. These are KVS teaching/revision resources, not CBSE official marking schemes. Subject availability varies; older packs must be mapped to the current syllabus.
CBSE 2026–27 · Sample question paper · CBSE · 2026-27 Official document listed by CBSE for 2026–27. Open at the publisher; no third-party solutions are represented as official. Sample papers are practice models, not previous board examination papers.
CBSE 2026–27 · Official marking scheme / answer key · CBSE · 2026-27 Official document listed by CBSE for 2026–27. Open at the publisher; no third-party solutions are represented as official. Sample papers are practice models, not previous board examination papers.
DIKSHA · curriculum learning resources · Ministry of Education / DIKSHA · Current portal Choose CBSE/NCERT, Class 12, subject and medium. This is a searchable portal, not a promise of a specific playable lesson.