Tutorial 3-may2025.pdf Tutorial document describing PL/SQL exercises and learning objectives. Tutorial 5-may2025.pdf Tutorial document with exercises involving functions like calculating total orders ...
Follow this step-by-step guide to install PostgreSQL, load data, connect to a database, and execute SQL queries including table joins PostgreSQL is an open-source, object-relational (also called ...
DECLARE total_products INT DEFAULT 0; # Do đây là biến cục bộ nên chỉ khai báo trong khối (begin-end) của 1 procedure thôi.
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