Triggers, type of trigger, Package... only specification enough , body required? Which is mandatory? If specification has 2 procedure and 2 functions and body doesn't have one function among them will it error ? Difference between procedure and package? What's a sequence ? Select seq.curval, seq.nextval from dual; - what will be the output of this query if it is a fresh sequence? Types of indexes? Views... can DML be performed in complex views? Example of implicit cursor ? What are cursors? Keys- primary , unique, composite ? Cursor attributes.. can we use cursor attributes in implicit cursor ? Reference cursor? Where can you find the list of views? What are Trigger event ? Materialized view? How materialized view is refreshed ? What is clustered index? Btree index?