Oracle SQL & PL-SQL

PL/SQL For Beginners

The Complete PL/SQL Bootcamp : "Beginner to Advanced PL/SQL"

Write SQL SELECT queries that actually perform. Most beginners use SELECT * Then wonder why their queries are slow. Here’s the real issue: SELECT * loads every column into memory. Your database processes data you don’t need. Result? Slower queries and higher resource usage. Write performance-focused SQL instead: • Select only required columns • Use WHERE to filter rows early • Reduce unnecessary data processing The result: Faster SQL queries Lower memory usage Better system performance This one