What is the difference between event sourcing and CRUD?

Question

Accepted Answer

**CRUD** — store current state. **Event Sourcing** — store all events.

**CRUD:**
- Store current state.
- Overwrite previous state.
- Simple implementation.
- History lost.

```
CRUD:
Account balance: $100
Deposit $50 → Balance: $150
(Previous state lost)
```

**Event Sourcing:**
- Store all events.
- Current state derived from events.
- Complete history.
- Audit trail.

```
Event Sourcing:
Events:
  1. AccountCreated: $0
  2. Deposited: $100
  3. Deposited: $50
Current: $150 (derived)
```

**Key differences:**
- **CRUD** — current state.
- **Event Sourcing** — all events.
- **CRUD** — simple.
- **Event Sourcing** — complete history.

Systems Analyst: What is the difference between event sourcing and CRUD?