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A free interactive Perl tutorial for people who want to learn the Perl programming language quickly. It has no downloads; users click a chapter and follow the instructions. Chapters cover topics such as Hello World, variables and types, scalars, arrays, hashes, conditional decisions, loops, operators, references, subroutines and regular expressions.
A tutorial website offering MySQL lessons covering basics, stored procedures, triggers, views and indexes, plus programming interfaces for PHP, Java, Python, Node.js and Perl. It includes a getting-started section intended to leave a local MySQL database with a sample database for practice.
Typing.io is a typing tutor for programmers whose lessons are based on open source code in languages such as JavaScript, Ruby, C, C++, Java, PHP, Perl, Haskell and Scala. It covers symbol keys, and the site describes it as free with sign-in.
