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Database - Interview Questions and Answers for 'Hcl' - 4 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     Asked in 24 Companies      basic        frequent


 Q2. How to Bulk upload the data into Oracle database?Database2016-10-21 12:36:26

Ans. We can use external table feature of Oracle.

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   Like         Discuss         Correct / Improve          Asked in 1 Companies      Intermediate


  Q3. What is database Normalization ?Database2017-01-09 12:00:02

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

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   Like         Discuss         Correct / Improve     normalization  database     Asked in 35 Companies      intermediate        frequent


 Q4. differences between drop , delete and truncateDatabase2019-12-17 12:36:12

 This question was recently asked at 'HCL Technologies'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies



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