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|Database - Interview Questions and Answers for 'Impetus technologies' - 1 question(s) found - Order By Newest|
|Ans. When a Table Join itself , it's a Self Join. For example - we like to know the pair of department names where first dept has lesser employees than the later.|
Select D1.name , D2.name from Dept D1, Dept D2 where D1.employee_count < D2.employee_count
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|Like Discuss Correct / Improve  sql  joins  self join  self-join  Pair of employee names with first having lesser salary than later  Pair of department names where first dept has lesser employees than the later Asked in 26 Companies basic   frequent|
|What are Inner , Outer , Left and Right Joins in SQL ?|
|What is JDBC? Describe the steps needed to execute a SQL query using JDBC.|
|Difference between Inner and Outer Join ?|
|What is a Cursor ?|
|What are temp tables ?|
|Does SQL allow null values ? Can we use it within Where clause ?|
|Write an SQL to find all records having all upper case alphanumeric characters in a field ?|
|Write an SQL to find all records having all numeric characters in a field ?|
|Do you know of any DB statement that can be used if we would like to insert multiple rows into a table ?|