Independent practice · SQLite

Classify first-response SLA

Practice dataset

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Your task

Return ticket_id, sla_status sorted ascending for the daily cohort at minute 1800.
Earlier-than-open observed reply → invalid_time. Otherwise elapsed > policy limit → breached; observed timely reply → met; timely unanswered ticket → awaiting.
Use P1=30, P2=120, P3=480 from policies. Equality meets the policy.

Pass every output check to complete this task. Suggested active time: 10 minutes. You can keep working after that.

Required output

Return exactly these columns in this order.

ticket_idnumber
sla_statusstring

Expected output: 8 rows. Keep the requested row order.

Values, data types and the number of copies of each row must match. A missing value is distinct from zero and from an empty string.

Preserve SQL NULL unless the task explicitly gives a replacement rule. Check JOINs for extra copies of rows.

Reconciliation checks

Every requested business key appears once.
Preserve SQL NULL and exact output column names.

Need a next step?

Hint 1: where to start

Join the supplied policy table by priority.

Hint 2: build the method

Check invalid timestamps before duration.

Hint 3: check your work

Use > for breached, then distinguish known from missing observed replies.

How your work is checked

Every output check must pass. The score shows how much matched and helps you find mistakes; completion comes from passing all checks. Active time is recorded separately.

Passing records a correct practice output on this device. It is not a professional certification.

Source materials

20 original source records.

Data dictionary

tickets.ticket_id integer: Unique ticket key.
tickets.team text: Owning queue, preserved in handoff.
tickets.priority text: Policy key; P1=30, P2=120 and P3=480 elapsed minutes.
tickets.opened_min integer: UTC elapsed minutes since the scenario origin.
tickets.first_reply_min integer | null: First reply timestamp; future replies are not yet observed and earlier-than-open replies are invalid.
tickets.owner text | null: NULL owner requires assignment when no higher-priority issue exists.
evidence.evidence_id text: Stable reply receipt ID. Exact repeated receipts do not imply extra replies.
evidence.ticket_id integer: Receipt ticket; unmatched receipts are an audit exception.
evidence.recorded_min integer: Receipt time must equal first_reply_min and be no later than as-of.
evidence.kind text: Only public_reply is accepted; internal_note is not a reply receipt.
policies.priority text: Unique SLA policy key.
policies.limit_minutes integer: Allowed elapsed minutes; equality meets the SLA.

View database setup and records

CREATE TABLE tickets (ticket_id INTEGER, team TEXT, priority TEXT, opened_min INTEGER, first_reply_min INTEGER, owner TEXT);
INSERT INTO tickets VALUES
(6000,'Billing','P1',1440,NULL,NULL),
(6001,'Technical','P2',0,120,'Agent 2'),
(6002,'Delivery','P3',1420,1805,'Agent 3'),
(6003,'Billing','P3',1439,NULL,'Agent 4'),
(6004,'Technical','P2',92,91,'Agent 5'),
(6005,'Delivery','P3',115,115,'Agent 6'),
(6006,'Billing','P1',138,168,'Agent 1'),
(6007,'Technical','P2',161,282,NULL),
(6008,'Delivery','P3',184,NULL,'Agent 3');
CREATE TABLE evidence (evidence_id TEXT, ticket_id INTEGER, recorded_min INTEGER, kind TEXT);
INSERT INTO evidence VALUES
('EV-6000',6001,120,'internal_note'),
('EV-6001',6002,1805,'public_reply'),
('EV-6002',6005,115,'public_reply'),
('EV-6003',6006,168,'public_reply'),
('EV-6004',6007,282,'public_reply'),
('EV-6001',6002,1805,'public_reply'),
('ORPH-6000',6999,10,'public_reply'),
('BAD-6000',6004,92,'public_reply');
CREATE TABLE policies (priority TEXT, limit_minutes INTEGER);
INSERT INTO policies VALUES
('P1',30),
('P2',120),
('P3',480);

Your work

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SQL query

Import answer

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Show the reference answer

WITH cohort AS (SELECT t.*,p.limit_minutes,CASE WHEN t.first_reply_min<=1800 THEN t.first_reply_min ELSE NULL END AS observed_reply FROM tickets t JOIN policies p ON t.priority=p.priority WHERE t.opened_min>=0 AND t.opened_min<1440), checked AS (SELECT c.*,CASE WHEN observed_reply<opened_min THEN 'invalid_time' WHEN COALESCE(observed_reply,1800)-opened_min>limit_minutes THEN 'breached' WHEN observed_reply IS NOT NULL THEN 'met' ELSE 'awaiting' END AS sla_status,(SELECT MIN(e.evidence_id) FROM evidence e WHERE e.ticket_id=c.ticket_id AND e.kind='public_reply' AND e.recorded_min=c.observed_reply AND e.recorded_min>=c.opened_min AND e.recorded_min<=1800) AS evidence_id FROM cohort c) SELECT ticket_id,sla_status FROM checked ORDER BY ticket_id

CASE ordering matters. Invalid timestamps must not pass as timely, and unresolved replies use the review clock.