# Duplicate changeSet not failing as expected

**URL:** <https://forum.liquibase.org/t/duplicate-changeset-not-failing-as-expected/3202>\
**Category:** General Discussion\
**Created:** [March 27, 2015, 12:14am UTC](https://forum.liquibase.org/t/duplicate-changeset-not-failing-as-expected/3202 "2015-03-27T00:14:00Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Kilna](https://avatars.discourse-cdn.com/v4/letter/k/f08c70/32.png) [@Kilna](https://forum.liquibase.org/u/Kilna)\
**Post date:** [March 27, 2015, 12:14am UTC](https://forum.liquibase.org/t/duplicate-changeset-not-failing-as-expected/3202/1 "2015-03-27T00:14:00Z")

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So I have an Oracle database which I am updating… in the process of testing my DB build system, I created a new change which is identical in content to an older change with a different ID. Both are adding a column with the same name, using SQL. I would expect the 2nd to fail, since it would attempt to create a column which already exists, but the liquibase command updateTestingRollback reports:

```
Liquibase ‘updateTestingRollback’ Successful Any ideas what the potential cause may be?
```
 
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```
- ALTER TABLE person ADD (col_a VARCHAR(1)); ALTER TABLE person DROP COLUMN col_a; - ALTER TABLE person ADD (col_a VARCHAR(1)); ALTER TABLE person DROP COLUMN col_a;
```