182 articles tagged #Debugging
Your partial index exists, VACUUM has run, and EXPLAIN still shows a sequential scan. The culprit is almost always a type mismatch between your query's WHERE clause and the index predicate. Here's how to diagnose and fix it fast.
A wireless mouse that stutters, skips, or lags mid-click can grind your workflow to a halt. Before you order a replacement, these software and physical fixes almost always solve it — no new hardware required.
Your HAVING clause looks correct but keeps dropping groups you know should be there. This guide breaks down every common reason HAVING silently eliminates valid rows — NULLs, type mismatches, WHERE vs HAVING confusion — and shows you exactly how to fix each one.
Your CASE WHEN logic looks correct, but the column keeps coming back NULL. This happens more often than you'd expect, and the root causes are almost always subtle — mismatched types, NULL comparison traps, or a missing ELSE clause silently swallowing rows.
Your SUMIFS formula looks correct but keeps returning zero. The culprit is often numbers stored as text in your sum range — a silent data type mismatch Excel won't warn you about. Here's how to find and fix it fast.
Your Tableau dashboard looks complete, but certain rows keep disappearing without any error. If your data spans multiple time zones, a quiet UTC offset mismatch in date filters is likely the culprit. Here's how to catch and fix it.
Your SUMPRODUCT formula looks right, but it keeps returning zero — and the only thing unusual about your sheet is a handful of merged cells in the criteria column. Here's exactly why that happens and how to fix it.
Your SUMIFS formula looks right, but it returns zero the moment you swap a cell reference for an array constant like {"North","South"}. Here's exactly why that happens and four reliable ways to fix it.
Your SUMIFS formula looks correct, but it keeps returning zero whenever you use date criteria. The culprit is almost always text-formatted date cells that Excel refuses to compare as real dates. Here's how to diagnose and fix it fast.
Your SUMIFS formula looks correct, but it's pulling in rows you never intended — rows where the criteria cell is blank or holds a number stored as text. Here's exactly why mixed data types trip up SUMIFS and how to fix it.
Getting a #VALUE! error from XLOOKUP when your return array spans multiple columns? This is a common spill behavior trap. Learn exactly why it happens and how to fix it in a few keystrokes.
COUNTIFS applies AND logic by default, so combining OR conditions inside one formula silently undercounts your data. Here's exactly why it breaks and four reliable patterns to fix it.