How to fix the Oracle error ORA-30344: number of child cols different from number of parent level cols?

In this post, you’ll learn more about the Oracle ErrorORA-30344: number of child cols different from number of parent level cols with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-30344: number of child cols different from number of parent level cols

Reason for the Error ORA-30344: number of child cols different from number of parent level cols

The number of child columns specified in a JOIN KEY clause is not the same as the number of columns in the specified parent level.

How to fix the Error ORA-30344: number of child cols different from number of parent level cols ?

You can fix this error in Oracle by following the below steps

Check the child columns and the columns in the definition of the referenced parent level and correct the discrepency.