Does a primary key have to be a number?
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what are %TYPE and %ROWTYPE? what is the difference?
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query to retrive the employees whose sal is greater than avg sal
What are the two types of exceptions.
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What are the different ways to optimize a sql query?
what are the differences among these table level lock modes - IN SHARE MODE, IN SHARE UPDATE MODE, IN EXCLUSIVE MODE ?
Explain clause in sql?
What does the argument [or replace] do?
How can I change database name in sql?
What are the query optimization techniques?
Why do we use cursors?
What is difference between primary and secondary key?
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