Why should you care?

Interviewers and stakeholders ask how you would model airline reservation system on Oracle — this lesson gives you a concrete starting schema.

See it live — copy this example

Run these statements in SQL Developer or SQL*Plus against your lab PDB. Prefer a practice user — not SYS — for application SQL.

-- OracleCore project sketch: Airline Reservation System
CREATE TABLE AIRLINE_RESERVATION__master (
  id           NUMBER GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
  ref_code     VARCHAR2(40) NOT NULL,
  status       VARCHAR2(20) DEFAULT 'ACTIVE',
  amount       NUMBER(14,2),
  created_at   TIMESTAMP DEFAULT SYSTIMESTAMP
);

CREATE INDEX ix_AIRLINE_RESERVA_ref ON AIRLINE_RESERVATION__master(ref_code);

INSERT INTO AIRLINE_RESERVATION__master (ref_code, amount) VALUES ('REF-1001', 1500.00);
COMMIT;

SELECT ref_code, status, amount, created_at
FROM AIRLINE_RESERVATION__master
WHERE status = 'ACTIVE'
ORDER BY created_at DESC;

What happened?

• IDENTITY creates ids automatically.
• ref_code is a business key.
• The index speeds lookups.
• SELECT proves the table works.

Practice next

1. Create the table in your PDB lab user.
2. Insert 3 sample rows with different statuses.
3. Run the SELECT and explain the columns to a friend.
4. Change one literal in the example and re-run.
5. Write a second example from memory without looking.

Remember

You can explain Airline Reservation System in plain English. You ran at least one related command or query. You know one real system where it matters.

Airline Reservation System

An enterprise team starts Airline Reservation System on Oracle with a master table and clear status values.

Outcome: You have a runnable schema sketch and a query to demo.