vs Oracle — SQL Technical Interview Questions & Answers

vs Oracle

vs Oracle

  • Oracle Database is a commercial RDBMS. MySQL is open-source (Oracle the company also owns the MySQL product). SELECT/JOIN ideas transfer. PL/SQL, DUAL, VARCHAR2, NVL are Oracle dialect — use IFNULL/CASE in MySQL.
  • Trap: saying they are the same. Trap: ‘MySQL has no transactions’ — InnoDB does.
  • On the example next to this theory: vs Oracle: create two demo rows, then SELECT qty >= 2 ordered. Say which labels come back.

Technical Interview Tip: Same relational idea, different product and dialect.

Code Examples for vs Oracle

vs Oracle — sample query

-- vs Oracle
CREATE TABLE demo (
  id INTEGER PRIMARY KEY,
  label TEXT NOT NULL,
  qty INTEGER DEFAULT 0
);
INSERT INTO demo (id, label, qty) VALUES
  (1, 'alpha', 2),
  (2, 'beta', 5);
SELECT label, qty FROM demo WHERE qty >= 2 ORDER BY qty DESC;

vs Oracle: create two demo rows, then SELECT qty >= 2 ordered. Say which labels come back.

How to Explain vs Oracle to an Interviewer

Is Oracle the same as MySQL?

No Both SQL, different product