Materials on AI, Python, Git, SQL, Web/API, SAP/ERP, statistics and time series: explanations, examples, practical tips, sources and applicability limits.
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Selecting the right ON DELETE action is a data-retention decision, not a syntax choice. RESTRICT protects dependents, CASCADE removes lifecycle children, and SET NULL preserves rows with optional references.
Compare RESTRICT, CASCADE and SET NULL using a small isolated example, then check the actual constraint and dependent rows before changing real data.
A practical guide to using pathlib for file existence checks, extension manipulation, directory navigation, and path resolution without introducing platform-specific bugs on Windows or Unix systems.
A posting rejection is usually a period-control issue, not a document-date mistake. The journal entry date is the document issue date, while the posting date determines the posting period that the system checks. The posting period variant, not the fiscal year variant, opens and closes periods for the header and for each account type.
This document outlines the appropriate correction routes for financial journal entries versus supplier invoice corrections within SAP S/4HANA, emphasizing reversal, credit memos, and cleared items, and avoiding general advice across modules.
How retrieval connects a language model to documents, and why a citation is not a guarantee.
A practical order for comparing SAP reports: organizational scope, ledger, fiscal period, currency and line-item detail.
Understand IS NULL, three-valued logic and the difference between COUNT(*) and COUNT(column).
Distinguish response access from request sending, inspect an OPTIONS preflight and configure explicit origins for credentialed browser requests.