T-SQL Advanced Queries: CTEs, Window Functions, and Performance
T-SQL Advanced Queries: CTEs, Window Functions, and Performance - Implementation Details
Which T-SQL feature saved you the most time recently?
Architecture Decision and Tradeoffs
When designing data management solutions with SQL Server, consider these key architectural trade-offs:
| Approach | Best For | Tradeoff |
|---|---|---|
| Managed / platform service | Rapid delivery, reduced ops burden | Less customisation, potential vendor lock-in |
| Custom / self-hosted | Full control, advanced tuning | Higher operational overhead and cost |
Recommendation: Start with the managed approach for most workloads and move to custom only when specific requirements demand it.
Validation and Versioning
- Last validated: April 2026
- Validate examples against your tenant, region, and SKU constraints before production rollout.
- Keep module, CLI, and SDK versions pinned in automation pipelines and review quarterly.
Security and Governance Considerations
- Apply least-privilege access using RBAC roles and just-in-time elevation for admin tasks.
- Store secrets in managed secret stores and avoid embedding credentials in scripts or source files.
- Enable audit logging, data protection policies, and periodic access reviews for regulated workloads.
Cost and Performance Notes
- Define budgets and alerts, then monitor usage and cost trends continuously after go-live.
- Baseline performance with synthetic and real-user checks before and after major changes.
- Scale resources with measured thresholds and revisit sizing after usage pattern changes.
Official Microsoft References
- https://learn.microsoft.com/sql/
- https://learn.microsoft.com/azure/azure-sql/
- https://learn.microsoft.com/fabric/database/
Public Examples from Official Sources
- These examples are sourced from official public Microsoft documentation and sample repositories.
- Documentation examples: https://learn.microsoft.com/sql/
- Sample repositories: https://github.com/microsoft/sql-server-samples
- Prefer adapting these examples to your tenant, subscriptions, and governance requirements before production use.
Discussion