Filing cabinet vs storage bins
Day 14 of 149
👉 Full deep-dive with code examples
Two Ways to Store Things
Filing Cabinet (SQL):
- Organized folders
- Each drawer has same structure
- Everything has a place
- Finding things: easy!
Storage Bins (NoSQL):
- Flexible containers
- Throw anything in
- Different boxes, different stuff
- Finding things: depends!
SQL Databases
Structured Query Language
Think spreadsheets with strict rules:
| id | name | age | |
|---|---|---|---|
| 1 | Sreekar | sreekar@email.com | 25 |
| 2 | Alex | alex@email.com | 30 |
Rules:
- Every row has same columns
- Can't add random new columns
- Data types are usually enforced (age is typically a number)
Good for: Banking, orders, anything needing consistency
NoSQL Databases
NoSQL databases often have more flexible structure
{
"name": "Sreekar",
"email": "sreekar@email.com",
"hobbies": ["coding", "reading"],
"address": {
"city": "Sydney"
}
}
Can store:
- Different fields per record
- Nested data
- Lists and objects
Good for: Social media, real-time apps, changing requirements
Quick Comparison
| SQL | NoSQL |
|---|---|
| Tables with rows | Documents or key-value |
| Fixed structure | Flexible structure |
| Joins are easy | Joins are hard |
| Scale vertically | Scale horizontally |
| MySQL, PostgreSQL | MongoDB, Redis |
In One Sentence
SQL uses rigid tables for structured data; NoSQL uses flexible formats for varied, evolving data.
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