Oracle DB Error ORA-22857 cannot modify columns of object tables

The following is the cause of this error:

An attempt was made to alter the object table by modifying existing columns. An object table cannot be altered to modify existing columns since it is based on an object type. The table definition must be in sync with the corresponding type.

Action you can take to resolve this issue: Create a new type with the desired attribute types and use it to create an object table. The new object table will have the desired columns.

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