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join tables mysql

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The performance of the above program is poor beaca
The performance of the above program is poor beacause the variable should be declare outside for the while loop. 

joins in servlet
what r the use of join in servlets?which pupose join can be used? 

about program join tables mysql through servlet
there is a problem in compilation in the above program. it create a problem in passing the query. 

I have got some error when i run it, try this PreparedStatement pst = connection.prepareStatement("SELECT *FROM emp_details NATURAL JOIN emp_info"); 

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