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Database - Interview Questions and Answers for 'Inner join' - 2 question(s) found - Order By Rating

Frequently asked in Cognizant ( Based on 2 feedback )
  Q1. What are Inner , Outer , Left and Right Joins in SQL ?Database
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


Related Questions

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

or

What is self Join and What is it's purpose ?
  Difference between Inner and Outer Join ?
 If Table A has 100 records and Table B has 50 records , how many records will the left join of Table A with Table B generate ?
 If Table A has 100 records and Table B has 50 records , how many records will the right join of Table A with Table B generate ?
 If Table A has 0 records and Table B has 50 records , how many records will the equi join of Table generate ?
 What is Left Outer Join ?
 Describe SQL Joins
 create an SQL query across multiple tables involving outer joins
 Explain Working of joins in sql.


 Q2. Difference between Inner and Outer Join ?Database
Ans. Inner join is the intersection of two tables on a particular columns whereas Outer Join is the Union of two tables.

 Help us improve. Please let us know the company, where you were asked this question :   

   Like         Discuss         Correct / Improve     sql   joins   inner join   outer join     Asked in 4 Companies      basic        frequent


Related Questions

 What are Inner , Outer , Left and Right Joins in SQL ?
 What is a self Join and give an example of a self Join ?

or

What is self Join and What is it's purpose ?
 If Table A has 100 records and Table B has 50 records , how many records will the left join of Table A with Table B generate ?
 If Table A has 100 records and Table B has 50 records , how many records will the right join of Table A with Table B generate ?
 If Table A has 0 records and Table B has 50 records , how many records will the equi join of Table generate ?
 What is Left Outer Join ?
 Describe SQL Joins
 create an SQL query across multiple tables involving outer joins
 Explain Working of joins in sql.



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