📚 Knowledge Garden

This is my long-term developer knowledge garden with my own summaries, explanations, examples, and notes.

⚠️ Copyright and exam safety policy: This section must only contain my own wording and derived learning notes. No copyrighted book text, no screenshots from commercial material, and no official IHK exam questions.

IHK

• IHK SQL: SELECT und WHERE
  • Difficulty: Beginner
  • Status: Learning
  • Last reviewed: 2026-07-15
  • Tags: sql, select, where