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| Database - Interview Questions and Answers for 'Deloitte' - 3 question(s) found - Order By Newest | ||||
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| Ans. Select salary from (select salary from employee where department = order by salary desc limit 5) emp order by salary limit 1 AND Select salary from (select salary from employee where department = order by salary desc limit 2) emp2 order by salary limit 1 | ||||
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 Discuss Correct / Improve  sql database find 2nd highest salary sql database  Asked in 1 Companies | ||||
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| Ans. Use Comparable or Comparator interface | ||||
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| Discuss Correct / Improve sql query Asked in 1 Companies | ||||
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| Ans. Primary key will not accept NULL values whereas Unique key can accept one NULL value. A table can have only primary key whereas there can be multiple unique key on a table. A Clustered index automatically created when a primary key is defined whereas Unique key generates the non-clustered index. | ||||
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| Discuss Correct / Improve Unique Key Primary Key Asked in 1 Companies | ||||
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