One foolproof method is to maintain a field called 'Last Extraction Date' and then impose a condition in the code saying 'current_extraction_date > last_extraction_date'.
What are the components of a PL/SQL block?
What are the datatypes a available in PL/SQL?
What are % TYPE and % ROWTYPE? What are the advantages of using these over datatypes?
What is difference between % ROWTYPE and TYPE RECORD?
What will the Output for this Coding> Declare Cursor c1 is select * from emp FORUPDATE; Z c1%rowtype; Begin Open C1; Fetch c1 into Z; Commit; Fetch c1 in to Z; end;
What are the Restrictions on Cursor Variables?
Can we declare a column having number data type and its scale is larger than pricesion ex column_name NUMBER(10,100), column_name NUMBAER(10,-84)
What will happen after commit statement?
Explain the usage of WHERE CURRENT OF clause in cursors?
What is a database trigger? Name some usages of database trigger?
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