# Why Liquibase doesn't check data in the DATABASECHANGELOG table in diff mode? **URL:** \ **Category:** General Discussion\ **Created:** [October 9, 2013, 4:17pm UTC](https://forum.liquibase.org/t/why-liquibase-doesnt-check-data-in-the-databasechangelog-table-in-diff-mode/2708 "2013-10-09T16:17:00Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![vskutin](https://avatars.discourse-cdn.com/v4/letter/v/85f322/32.png) [@vskutin](https://forum.liquibase.org/u/vskutin)\ **Post date:** [October 9, 2013, 4:17pm UTC](https://forum.liquibase.org/t/why-liquibase-doesnt-check-data-in-the-databasechangelog-table-in-diff-mode/2708/1 "2013-10-09T16:17:00Z")
Hello, It’s very strange for me: in the documentation ([http://www.liquibase.org/documentation/diff.html) ](http://www.liquibase.org/documentation/diff.html)%C2%A0) I’ve seen that Liquibase should check “Version Differences” in diff mode, but in reality it doesn’t check. What is the “version differences” in that case? If it’s only structures’ difference then I never know that somebody can deploy some changeSet with only DML operations and diff command always will return me “Product Version: EQUAL”. How I can compare Liquibase’s repository table (DATABASECHANGELOG) in two databases? Thanks. ---
**Author:** ![nvoxland](https://avatars.discourse-cdn.com/v4/letter/n/87869e/32.png) [@nvoxland](https://forum.liquibase.org/u/nvoxland)\ **Post date:** [October 9, 2013, 4:17pm UTC](https://forum.liquibase.org/t/why-liquibase-doesnt-check-data-in-the-databasechangelog-table-in-diff-mode/2708/2 "2013-10-09T16:17:00Z")
The diff logic does only check the database structure, not the contents of the tables, including the databasechangelog table. I can see where it would be helpful to see that there are changes added or missing from one database or the other. I created [https://liquibase.jira.com/browse/CORE-1523](https://liquibase.jira.com/browse/CORE-1523) to track the feature. Nathan