SQL
Locate each active asset’s inspection visits
BOTIE
Examples, experiments and workspace controls
Connect a tool's inputs to see what it produces. You can try a branch before connecting it to Result.
Try your own inputs
Use a copy of the example to try your own data. Keep the problem's assumptions in mind, and predict the effect of a change before checking the output. You can also add another branch to compare two ways of doing the calculation.
Context for this challenge
Filter the register on active before connecting it to the visit match.
Visit rows need a site from the register, but the report excludes inactive equipment.
Inspect the component calculation
Keep rows passing a comparison( Rows: Asset register with active flags Comparison value: 1 Field to compare: active Comparison: = )
Examples and results
- Asset register with active flags
[ { "asset_id": "P1", "site": "north", "kind": "pump", "active": 1 }, { "asset_id": "P2", "site": "north", "kind": "fan", "active": 1 }, { "asset_id": "P3", "site": "south", "kind": "pump", "active": 0 }, { "asset_id": "P4", "site": "south", "kind": "pump", "active": 1 } ]- Required result
[ { "asset_id": "P1", "site": "north", "kind": "pump", "active": 1 }, { "asset_id": "P2", "site": "north", "kind": "fan", "active": 1 }, { "asset_id": "P4", "site": "south", "kind": "pump", "active": 1 } ]
Try a fresh construction
This clears this draft, including its undo history. Earlier successful attempts stay recorded. Build again without opening hints to record an independent attempt.
Stuck? Inspect a worked construction
The tools below form one possible solution. You can assemble it, follow its signals, and undo that change to return to your own construction.
Assumptions and test precision
The workshop calculates over small record lists to make the relational operations visible. It is not a SQL parser or query planner. The worksheet runs SQLite and is the authority for SQL behaviour, including types and NULL. Numerical tests allow a difference of 0.001. Lists and structures must also have the right shape.
Your last tested pieces can start the full construction. An existing draft there keeps its own pieces.
Two visits reuse the same active register record
This check uses the pieces from “Attach the right site to each retained visit”.
BOTIE
- Inspection visits
[ { "inspection_id": 9, "asset_id": "P8", "minutes": 4 }, { "inspection_id": 8, "asset_id": "P8", "minutes": 6 } ]- Asset register with active flags
[ { "asset_id": "P8", "site": "west", "active": 1 } ]
Use a number, text, or an array matching the requested result. For a matrix, put each row in brackets. Saving your prediction runs your current construction on these inputs and checks the earlier examples too.
Build a construction in the workspace above first. This case will test those pieces.
What would change if the join used kind and several assets shared that value?
A match emits pairs. A unique key is evidence that each visit has at most one partner.
The workshop calculates over small record lists to make the relational operations visible. It is not a SQL parser or query planner. The worksheet runs SQLite and is the authority for SQL behaviour, including types and NULL.
Work through the SQL challenges →