Combine schema design, safe writes, joins, grouped reporting, and transaction verification in a bounded SQL workflow with an explainable handoff.

What you will be able to do

Distinguish source tables from reporting query in a realistic sql fundamentals capstone case.
Interpret the database evidence and boundary associated with change boundary.
Choose an appropriate action involving verified output without exceeding the named data scope.
Verify data handoff through an observable database result and reproducible handoff.

Frame SQL Fundamentals Capstone

Combine schema design, safe writes, joins, grouped reporting, and transaction verification in a bounded SQL workflow with an explainable handoff.

A small training center needs students, courses, and enrollments plus a report of active enrollment counts. One withdrawn enrollment must be corrected without disturbing other records.

Keep the database target, stored state, input values, expected result, and allowed change scope separate. Begin in an isolated practice database, inspect before modifying, and preserve enough evidence to repeat the decision.

Source tables

A capstone schema separates subjects while preserving their relationships. Within sql fundamentals capstone, this concept answers a separate data question and retains its own observable evidence.

Define students, courses, and enrollments with stable keys. Apply that action to the named database case before broadening the query or changing more stored state.

Respect this boundary: do not repeat all student and course facts in enrollment rows. The required result is specific: each table has one clear row grain and identity.

Reporting query

A reporting query can filter, join, group, and summarize related rows. Within sql fundamentals capstone, this concept answers a separate data question and retains its own observable evidence.

Build active counts in stages and inspect cardinality after each join. Apply that action to the named database case before broadening the query or changing more stored state.

Respect this boundary: do not hide a duplicated join behind a final aggregate. The required result is specific: course counts reconcile with active enrollment detail.

Change boundary

A transaction groups related statements into one commit or rollback decision. Within sql fundamentals capstone, this concept answers a separate data question and retains its own observable evidence.

Preview and update the withdrawn enrollment inside a transaction. Apply that action to the named database case before broadening the query or changing more stored state.

Respect this boundary: do not commit before checking the target and a control row. The required result is specific: only the intended enrollment changes state.

Verified output

Verification compares stored rows with the business report after the change. Within sql fundamentals capstone, this concept answers a separate data question and retains its own observable evidence.

Rerun the active-count report and inspect the affected course. Apply that action to the named database case before broadening the query or changing more stored state.

Respect this boundary: do not validate only the update command count. The required result is specific: the report changes by the expected bounded amount.

Data handoff

A useful handoff identifies assumptions, commands, evidence, and remaining limits. Within sql fundamentals capstone, this concept answers a separate data question and retains its own observable evidence.

Record the schema map, query purpose, transaction result, and checks. Apply that action to the named database case before broadening the query or changing more stored state.

Respect this boundary: do not include secrets or rely on undocumented screen state. The required result is specific: another analyst can reproduce the workflow safely.

Apply SQL Fundamentals Capstone to One Case

Use the case as a bounded database task: A small training center needs students, courses, and enrollments plus a report of active enrollment counts. One withdrawn enrollment must be corrected without disturbing other records.

First, define students, courses, and enrollments with stable keys. Then, build active counts in stages and inspect cardinality after each join. Keep both observations with the target database and expected result before choosing the next statement.

Next, preview and update the withdrawn enrollment inside a transaction. After that, rerun the active-count report and inspect the affected course. Finish only after you record the schema map, query purpose, transaction result, and checks.

Recap Before Practice and Prove

Source tables: A capstone schema separates subjects while preserving their relationships. In the database case, define students, courses, and enrollments with stable keys. Preserve the boundary: do not repeat all student and course facts in enrollment rows.

Reporting query: A reporting query can filter, join, group, and summarize related rows. In the database case, build active counts in stages and inspect cardinality after each join. Preserve the boundary: do not hide a duplicated join behind a final aggregate.

Change boundary: A transaction groups related statements into one commit or rollback decision. In the database case, preview and update the withdrawn enrollment inside a transaction. Preserve the boundary: do not commit before checking the target and a control row.

Verified output: Verification compares stored rows with the business report after the change. In the database case, rerun the active-count report and inspect the affected course. Preserve the boundary: do not validate only the update command count.

Data handoff: A useful handoff identifies assumptions, commands, evidence, and remaining limits. In the database case, record the schema map, query purpose, transaction result, and checks. Preserve the boundary: do not include secrets or rely on undocumented screen state.