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Database - Interview Questions and Answers for 'Outer join' - 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. Difference between Inner and Outer Join ?Database
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Ans. Inner join is the intersection of two tables on a particular columns whereas Outer Join is the Union of two tables.

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   Like         Discuss         Correct / Improve     sql   joins   inner join   outer join     Asked in 3 Companies      basic        frequent


 Q3. What is Left Outer Join ?Database2018-01-05 15:25:44

 This question was recently asked at 'NIIT Tech,Cogent Infotech Corp'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     database   database joins   left outer join  sql     Asked in 2 Companies


 Q4. create an SQL query across multiple tables involving outer joins Database2019-01-27 16:06:28

Ans. Select * from table1 t1Left outer join table2 t2 on t1.tid = t2.id

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   Like         Discuss         Correct / Improve     sql query  database  outer joins     Asked in 2 Companies




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