Guides ยท Technology
Intro to SQL Queries
Query relational data
SQL lets you retrieve and combine table data with clear clauses and joins.
- select
- where
- join
- group by
- order by
Select and Filter
Use SELECT columns FROM table WHERE conditions to narrow rows.
Join Data
INNER, LEFT joins link tables on keys; watch for duplicates and nulls.
Aggregate
GROUP BY with COUNT, SUM, AVG summarizes data; ORDER BY sorts results.
Keep Exploring
Guides
API Basics
APIs let software request data or actions from other systems through defined endpoints and responses.
Comparison
RAM vs Storage
RAM handles what your device is actively working on, while storage keeps apps, files, and system data available over time.
How it works
Global Positioning System
GPS uses timing signals from satellites to calculate a receiver's position on Earth.
What it is
Blockchain
A blockchain is a distributed ledger secured by cryptography and consensus nodes.