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Database - Interview Questions and Answers for 'Epam' - 2 question(s) found - Order By Newest

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  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


Related Questions

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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 ?
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 Describe SQL Joins
 create an SQL query across multiple tables involving outer joins
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 Q2. How can we increase the speed of SQL queries ?Database2019-07-13 15:35:43

 This question was recently asked at 'Epam'.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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