How to delete a column in an existing table in oracle?
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Difference between join and a subquery?
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How to use subqueries with the in operator using oracle?
How to define a specific record type?
What are the various oracle database objects?
various types of hints and their usage
When do you get a .pll extension in oracle? Explain its importance
what is the difference between rollback & commit? can a foreign key has null value?
Why do you use stored procedures and state some of its disadvantages?
What is Water Mark in Oracle?
How do I decide when to use right joins/left joins or inner joins or how to determine which table is on which side?
can you explain performance tunning in oracle(sql,PL/SQL)
What is dictionary cache ?