Step-by-step tutorials on Excel, Python, databases, and developer tools
31 articles
Your SUMIFS formula looks right, but the moment you point a criteria range at another sheet, you get zero. Here's why it happens and exactly how to fix it without restructuring your workbook.
Got a comma-separated string crammed into a single PostgreSQL column? Learn how to split it into individual rows using string_to_array, unnest, regexp_split_to_table, and lateral joins — with real query examples you can copy today.
Dumping Postgres query results to a CSV file is something you'll need constantly — for reports, data handoffs, or feeding a spreadsheet. Here's exactly how to do it with COPY and psql's \copy, with no guesswork.
Combining data from multiple Excel sheets shouldn't mean copy-pasting between tabs for an hour. Learn how to use Pandas to read, clean, and merge every sheet into a single DataFrame — with real code you can adapt today.
ISO 8601 strings look simple until Python's datetime module starts throwing ValueError or silently dropping timezone info. Here's how to parse them correctly, avoid naive vs. aware confusion, and handle edge cases like UTC offsets and Z suffixes.
Duplicate rows in a Postgres table with no primary key are a real headache — but ROW_NUMBER() gives you a surgical way to find and delete exactly the extras without touching the originals. Here's how to do it safely.
Your pivot table refuses to group dates and just shows a greyed-out option or an error. This almost always comes down to a few fixable data problems — here's exactly how to diagnose and solve them.
VLOOKUP's approximate match mode can silently drop rows from your results without any error message — just wrong data that looks right. Here's how to find where it's happening and fix it for good.
Got a wide spreadsheet with months or categories spread across dozens of columns? Power Query's Unpivot feature reshapes that data into a clean, analysis-ready format in minutes — no formulas required.
Nested JSON from APIs is a common headache — objects buried inside arrays, arrays inside objects, keys that shift shape between records. Here's how to flatten it completely into a clean Pandas DataFrame without dropping a single field.
Managing databases remotely can significantly enhance your workflow, especially when working on applications or projects hosted online. Whether you're a developer, a data analyst, or a website administrator, gaining remote access to databases like PostgreSQL or MySQL through cPanel opens the door
When working with large datasets in Excel, you might often need to perform calculations across specific columns while skipping others. One common requirement is summing values from either odd or even-numbered columns. Rather than manually selecting each column, Excel offers several powerful methods