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Thanks for visiting my website. I hope you enjoyed my articles and found some inspiration for your project. Suggestions and criticism are always welcome. Feel free to send me an email: info@marcus-belz.de

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Article Series

Data Quality in an ETL Process
Data Quality Checks with SQL
Data Migration: SQL Server → PostgreSQL
AI-Assisted SQL Development
Structuring & Formatting SQL
SSIS vs. T-SQL

Categories

AI & Development (23)
Data Quality (8)
Database Deployment (5)
SQL & Databases (37)

Latest Posts

Data Quality: Dimensions and Error Classes — the Theory Behind the SQL Checks
Published Jul 2, 2026 · Updated Sep 27, 2026
Skills vs. Rules in Claude Code — What Auto-Loads, What Loads on Demand, and the Context Cost
Published Jul 6, 2026 · Updated Sep 28, 2026
The Agent Measures Where I Click — Debugging Postgres, Docker and a Swapping Server with a Coding Agent
Published Sep 11, 2026 · Updated Sep 23, 2026
Set-Based vs. Row by Row: PostgreSQL Refresh from 114 to 12 Seconds
Published Sep 23, 2026
Why sqlfluff Can’t Lint Our SQL Conventions — and a 240-Line Script Can
Published Aug 23, 2026 · Updated Sep 21, 2026

Tags

AI-Assisted Development (12) AI Agents (6) Claude Code (21) Code Quality (6) Data Migration (7) Data Quality (18) Data Type (6) Developer Workflow (19) ETL Process (7) PL/pgSQL (6) PostgreSQL (18) Readability (7) SQL Server (6) T-SQL (11) TRY_CONVERT (6) Type Conversion (8)

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AI (1) AI-Assisted Development (12) AI Agents (6) Automation (1) Backfill (1) Change Tracking (1) CI/CD (2) Claude (1) Claude Code (21) Code Quality (6) Comparison (1) Context Management (1) Conventions (3) Database Deployment (5) Data Integration (1) Data Migration (7) Data Quality (18) Data Quality Dimensions (1) Data Quality Rules (4) Data Transfer (1) Data Type (6) Data Type Mapping (1) Design Pattern (5) Developer Workflow (19) Duplicates (1) Dynamic SQL (4) ELT (1) Error Classification (1) ESLint (1) ETL (1) ETL Process (7) Expand/Contract (1) Formatting (5) GitHub Actions (2) Logging (1) Maintainability (3) Metadata (1) Naming Convention (4) PL/pgSQL (6) Postgres (5) PostgreSQL (18) Project Setup (1) Project Template (1) Prompt Engineering (1) Readability (7) Referential Integrity (1) Schema Evolution (3) Schema Migration (3) Source Control (1) SQL Server (6) SSIS (5) SSIS vs. SQL (4) Stored Procedure (1) T-SQL (11) Table Design (1) Theory (1) TRY_CONVERT (6) Type Conversion (8) Validation (1) Verification (1)