Explain sub-query?
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Do you know what is recursion? Is it possible for a stored procedure to call itself or recursive stored procedure? How many levels of sp nesting is possible?
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What is the optimization being performed in oracle and SQL Server?
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What is a Join and explain its types?
What is the difference between WHERE AND IN? OR 1. SELECT * FROM EMPLOYEE WHERE EMPID=123 2. SELECT * FROM EMPLOYEE WHERE EMPID IN (123) WHAT IS THE DIFFERENCE?
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What is Left Outer Join?