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Database - Interview Questions and Answers for 'Accenture' - 6 question(s) found - Order By Newest

Frequently asked in Cognizant ( Based on 2 feedback )
  Q1. What are Inner , Outer , Left and Right Joins in SQL ?Database2017-01-09 13:07:55

Ans. Inner join is the intersection of two tables on the condition defined by the where clause i.e will get records from both tables matched by a column.

Outer join is the union of two tables i.e will get all records from both tables and will put null in the columns where related records are not present.

Left Outer join is the left union of two tables i.e all records from the table on the left and values from the right table for related records else null for the columns from right table.

Right Outer join is the right union of two tables i.e all records from the table on the right and values from the left table for related records else null for the columns from left table.

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   Like      Discuss      Correct / Improve     sql  inner join  outer join  right join  left join     EPAM  Antra  MSCI  HCL Technologies  Cognizant (CTS)  Morgan Stanley  Wipro  Infosys  Accenture  IBM  PayPal  A9.com  Curriculum Associates  Gold Coast IT  Kobie Marketing  Hybris  Aptroid Technologies  E2open  IGATE  SnapDeal  Verilogue  Span Infotech      basic        frequent


  Q2. What is a self Join and give an example of a self Join ?

or

What is self Join and What is it's purpose ?
Database2016-06-30 20:13:35

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     Accenture  West Monroe Partners  Oracle  eBay  Impetus Technologies  Bank of America  Fannie Mae  Wize Commerce  Kleward Consulting  Pyramid Consulting  Interra Information Technologies  Trigent Software  Xtreme Media  IGATE  Nagarro  Six Sigma  Nityo Infotech  Fujitsu  BlazeClan  Twist Bioscience  Invoyent  Cognizant (CTS)  i2c  Capgemini      basic        frequent


 Q3. How to delete duplicate elements in a table ?Database2016-12-13 14:58:38

Ans. DELETE FROM TABLE WHERE ROW_NUM NOT IN ( SELECT MAX(ROW_ID) FROM TABLE GROUP BY DUPLICATE_FIELD )

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   Like      Discuss      Correct / Improve          Myntra  Accenture


  Q4. What is database Normalization ?Database2017-01-09 12:00:02

Ans. https://en.wikipedia.org/wiki/Database_normalization

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 Q5. Write a SQL to delete duplicate records in a tableDatabase2017-04-20 06:42:22

Ans. DELETE FROM TABLE WHERE ROW_NUM NOT IN ( SELECT MAX(ROW_ID) FROM TABLE GROUP BY DUPLICATE_FIELD )

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   Like      Discuss      Correct / Improve          Amdocs  Accenture


 Q6. Design a Database Schema to store Employee Information with each employee having multiple addresses. Database2017-08-24 13:48:56

Ans. We can have 2 entities i.e EMPLOYEE and ADDRESS and can have a relationship Table , EMPLOYEE_ADDRESS having one to may relationship between the two.

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   Like      Discuss      Correct / Improve     database schema   design     Accenture




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