Why Am I Getting ORA-00942: Table or View Does Not Exist?

ORA-00942 Error Investigation: Table or View Absence

The ORA-00942 error can occur when a user attempts to interact with a table that does not exist within the database. This can be particularly frustrating when encountering this error during an INSERT operation, as demonstrated in the provided code snippet.

The reported error indicates that the table "customer" cannot be found. One common cause for this is attempting to access the table using a different user or schema than the one that created it. In this scenario, the user connected with the system account has likely created the table, but the user with limited privileges is attempting to access it.

However, another possible cause of the ORA-00942 error, especially in Oracle 12c environments, can be related to sequence usage. If a table uses a sequence to set a default value for one of its columns, and the user executing the INSERT query lacks the SELECT privilege on the sequence.

To illustrate this case, consider the following scenario:

• User1 creates a table "customer" with a sequence "seq_customer_id" for default value generation.
• User2 is granted SELECT, INSERT, UPDATE, and DELETE privileges on "customer" but not on "seq_customer_id".
• When User2 attempts to insert data into "customer" without prefixing the schema owner name, the ORA-00942 error arises.

The solution to this issue is to grant the SELECT privilege on the sequence to the user executing the INSERT query:

GRANT SELECT ON seq_customer_id TO User2;

By ensuring appropriate privileges are granted not only on the table but also on any related sequences, users can avoid the ORA-00942 error and successfully interact with tables in their database.

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