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Database - Interview Questions and Answers for 'A9.com' - 2 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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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


Frequently asked to fresh graduates.
 Q2. What is ACID ?Database2016-11-04 08:09:44

Ans. ACID stands for Atomicity, Consistency, Isolation, Durability is a set of properties of database transactions.

Atomicity means all or nothing. i.e parts of a transaction shouldn't commit if any one of them fails. Either the whole transaction should succeed or it should be complete rollback.

Consistency means that any transaction should lead database from one stabe state to another.

Isolation means that the execution of transaction results in a system state that would be obtained if transactions were executed serially.

Durability means that when a transaction is committed it forms the permanent state of database.

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