Cloud database cost depends on measured compute, storage, backup retention, and network egress; build a workload-based estimate before migrating.
Practicing Azure SQL at Low Cost
Practicing Azure SQL can stay inexpensive with current free offers, serverless auto-pause, budget alerts, and deliberate resource cleanup.
SQL SERVER – What is Cloud Computing – Introduction to Cloud Computing
What is cloud computing? A plain answer for SQL Server people, the three service models, and what to check before you move a database there.