Recently encountered this 'ORA-00942: table or view does not exist' error. I found out that in my case, I created a table in the sales schema but was querying in the HR schema. Therefore this ORA-00942 error occurred because I was selecting the table from the wrong schema. This error can also occur in a number of ways.

Root Causes:

The ORA-00942 error can occur for many reasons:

1) Incorrect Table/View Name: First there might be a misspelled word in the table or view name provided in the SQL statement. Even a minor dissimilarity can lead to this error.

2) Inadequate Privileges: Not having the appropriate privileges can trigger the ORA-00942 error. Ensure that the user has the necessary privileges on the specified table or view.

3) Schema Context Mismatch: Like my case, if working with multiple schemas or namespaces, the error may occur if the table or view is located in a different schema than the one currently being used. Verifying the correct schema context is crucial.

Here are a few solutions:

To resolve the ORA-00942 error, consider the following solutions based on the root causes above:

1) Double-check the Table/View Name: Review the SQL statement and verify the accuracy of the table or view name. Ensure that the name matches exactly with the one in the database.

2) Grant Sufficient Privileges: The user should have appropriate permissions to select, insert, update, or delete data from the specified table or view. Contacting the database administrator to get access would be the fastest way to clear this error.

3) Use Schema Qualification: If working with multiple schemas, explicitly specify the schema name along with the table or view name in the SQL statement. This ensures that the correct object is referenced, even if there are objects with the same name in different schemas.

    The ORA-00942 error, indicating a "Table or View Does Not Exist" in Oracle, can be a source of frustration for developers and database administrators. Remember to pay attention to error details, consult the documentation, and seek assistance from the Oracle community when troubleshooting. I hope this helps.