Read a PostgreSQL EXPLAIN plan before adding an index
Find the expensive step and distinguish estimates from measurements.
PostgreSQL / SQL / Performance
TECHNOLOGY / KNOWLEDGE / PRACTICE
Search results: MM - Page 2
Practical guides to AI, Python, Git, SQL, Web/API, SAP/ERP and mathematical models, with explanations, code examples, sources and limitations. Page 2.
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Robust CSV Parsing in Python: Handling BOM, Dialects, and Newlines
A guide to using the Python csv module to automatically detect delimiters, handle Unicode Byte Order Marks (BOM) with utf-8-sig, and manage platform-specific newline issues using the Sniffer class and correct file opening parameters.
python / csv / data-processing / encoding / utf-8-sig / automation
Python: Reading JSON from Strings and Files, and Handling Decoding Errors
Learn how to parse JSON data in Python from both string literals and files, and how to effectively handle potential decoding errors using the built-in json module.
python / json / parsing / decoding / file handling / error handling / pathlib / data serialization
Relative Paths in Python: Terminal, IDE and Service Launches
How Python resolves relative paths depends on the process working directory, which varies by launcher. This guide shows how to inspect the working directory, choose and document an explicit path base, and understand why __file__ cannot always be trusted.
Python / pathlib / relative paths / working directory / __file__ / os.getcwd
Create a Python virtual environment without mixing dependencies
A small, repeatable setup for a project and a quick check that pip uses the right Python.
Python / venv / pip
SAP Organizational Structure: Relationship between Company Code, Chart of Accounts, and Controlling Area
An explanation of how SAP S/4HANA links Financial Accounting (FI) and Management Accounting (CO) through organizational objects.
enterprise
Why a Vendor Payment is Not a Double Expense and How to Trace It in SAP S/4HANA
In SAP S/4HANA, a payment to a vendor settles an existing liability from a posted invoice; it is not a new expense. Tracing the payment back to the original invoice is done using clearing documents, assignment fields, and line item displays.
SAP S/4HANA / Accounts Payable / Financial Accounting / Clearing / Document Flow / FI-AP
SAP FI and CO: two views of the same transaction
Understand financial reporting, internal cost allocation and their connection in S/4HANA.
SAP / FI / CO / S/4HANA
Universal Journal Reports: Check Scope Before Comparing Totals
A practical order for comparing SAP reports: organizational scope, ledger, fiscal period, currency and line-item detail.
SAP / Universal Journal / Reporting
Why JOIN Multiplies Rows: Matching Keys, Constraints and Output Grain
Diagnose repeated JOIN rows by counting matching keys, checking constraints and choosing whether the result should contain orders, items or summaries.
SQL / JOIN / PostgreSQL
SQL: WHERE vs HAVING - Difference in Row and Group Filtering
A detailed technical breakdown of the differences between WHERE and HAVING clauses, focusing on execution order, aggregate function compatibility, and performance optimization strategies.
SQL / PostgreSQL / Database / Query Optimization / Data Analysis
curl works, fetch fails: diagnosing CORS and preflight
Distinguish response access from request sending, inspect an OPTIONS preflight and configure explicit origins for credentialed browser requests.
HTTP / CORS / fetch / API / Troubleshooting