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Don Burleson Blog 







Materialized View with Object Type Fails with ORA-00904

Expert Oracle Database Tips by Donald BurlesonApril 18, 2015


Question:  I am trying to populate a materialized view with this code and it fails with an ORA-00904 error:  

SELECT * FROM TABLE (CAST (v_mf_record AS mf_table_type))');

ORA-00904: "V_MF_RECORD": invalid identifier  

Why cannot I use a CAST operator with an object type in a materialized view?  Isn't a PL/SQL collection array the same as a table?

Answer:   A relational table uses SQL, while a PL/SQL array (collection) is an in-memory heap within the region of a PL/SQL procedural language program, two different things!  

The Oracle documentation  notes that only relational tables view and other materialized views may be used in a materialized view FROM clause, else you get the ORA-00904 error:

 ?[In a Materialized View,] the FROM clause of the query can name tables, views, and materialized views."


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