PL/SQL
PL/SQL is a procedural extension of SQL used for programming Oracle databases. Its main uses include creating stored procedures, functions, and triggers to automate database processes and enhance performance.
Hello, world code example:
set serveroutput on
BEGIN
DBMS_OUTPUT.PUT_LINE('Hello world!');
END;
/
Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.