# Data Type Mismatch

> Source: https://sukruyusufkaya.com/en/glossary/veri-tipi-uyumsuzlugu
> Updated: 2026-05-13T21:13:59.613Z
> Type: glossary
> Category: veri-bilimi-ve-veri-yonetimi
**TLDR:** A problem arising when the expected data type of a field differs from the actual stored content type.

<p>Data type mismatch is a data cleaning issue that often looks simple but can create major downstream failures. Examples include storing dates as free text, keeping numeric columns with mixed characters, or recording categorical fields as unstructured strings. These mismatches cause errors in filtering, transformation, modeling, and reporting workflows. Data type validation is therefore not just a technical convenience, but a core layer of data integrity control.</p>