How to fix the Oracle error ORA-37188: unexpected null result while querying string?

In this post, you’ll learn more about the Oracle ErrorORA-37188: unexpected null result while querying string with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-37188: unexpected null result while querying string

Reason for the Error ORA-37188: unexpected null result while querying string

While querying the input fact table, the sparsity advisor unexpectedly got no results, possibly due to changes being made during operation.

How to fix the Error ORA-37188: unexpected null result while querying string ?

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

Retry the operation ensuring that the data is not changed while the sparsity advisor is running / Errors from 37200 – 37399 are reserved for events