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Redirect to:

Relational database#Constraints

This page is a redirect. The following categories are used to track and monitor this redirect:

From a cross-project redirect: This is a redirect from a title linked to an item on Wikidata. The Wikidata item linked to this page is constraint (Q20575568).
- Use this template only on hard redirects – for soft redirects use {{Soft redirect with Wikidata item}}.

To a section: This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{R to anchor}} instead.

When appropriate, protection levels are automatically sensed, described and categorized.