SQL · Theory

PostgreSQL vs MySQL

Theory

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PostgreSQL vs MySQL

Both are SQL databases with tables, JOIN, and transactions. MySQL is common with PHP/LAMP and shared hosting. PostgreSQL is stricter on types and SQL standard, with strong JSONB and GIS. Neither is always faster.

Watch dialect: MySQL backticks vs Postgres quotes, AUTO_INCREMENT vs SERIAL/GENERATED, IF() vs CASE. Learn JOIN once; check engine docs for functions.

Trap — ‘X is always faster’. Trap: pasting MySQL-only SQL into Postgres.

On the example next to this theory: PostgreSQL vs MySQL: create two demo rows, then SELECT qty >= 2 ordered. Say which labels come back.

Exam tip

Same SQL idea. Pick by team/hosting, not a winner slogan.

PostgreSQL vs MySQL — sample query

-- PostgreSQL vs MySQL
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;

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

Short notes

DefBoth RDBMS + SQL. MySQL = LAMP/hosting. Postgres = stricter/richer SQL.
RuleSame JOIN idea. Different quotes, keys, extras.
TrapCopying MySQL functions into Postgres.

-- PostgreSQL vs MySQL 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;

PostgreSQL vs MySQL

PostgreSQL vs MySQL — sample query

Short notes

Questions

PostgreSQL vs MySQL

PostgreSQL vs MySQL — sample query

Short notes

Questions