> ## Documentation Index
> Fetch the complete documentation index at: https://docs.bytebase.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Column Masking
Masking precedence: [Masking Exemption](/security/data-masking/access-unmasked-data) > [Global Masking Rule](/security/data-masking/global-masking-rule) > [Column Masking](/security/data-masking/column-masking).
In the project level, besides `Workspace Admin` and `DBA`, `Project Owner` can set table columns semantic type to mask the data.
This page covers relational databases. For document databases (**MongoDB** and **Elasticsearch**), field-level masking is configured through the collection/index Catalog instead — see [Document Database Masking](/security/data-masking/document-database-masking).
Go to the **table detail** page, and click the **pen icon** and apply the semantic type.
Combined with [Semantic Types](/security/data-masking/semantic-types), here is the result you will get in **SQL Editor**.
However, if the global masking rule is also applied, the result will be as follows. Because the global masking rule takes precedence over the column masking.
