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A foreign key is a column or a group of columns in a database table that uniquely identifies a row in another table.
A foreign key establishes a relationship between two tables in a database.
It ensures referential integrity by enforcing a link between the data in the two tables.
Foreign keys help maintain data consistency and prevent orphaned records.
Example: In a database with tables for 'orders' and 'customers', the 'c...
DDL stands for Data Definition Language. It is used to define the structure of database objects.
DDL commands are used to create, modify, and delete database objects such as tables, indexes, and views.
Examples of DDL commands include CREATE, ALTER, and DROP.
DDL commands are not used to manipulate data within the database, that is done using DML (Data Manipulation Language) commands.
Types of constraints include primary key, foreign key, unique, check, and default constraints.
Primary key constraint ensures each row in a table is unique.
Foreign key constraint enforces referential integrity between two tables.
Unique constraint ensures that all values in a column are distinct.
Check constraint restricts the values that can be inserted into a column.
Default constraint provides a default value for a colu
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I appeared for an interview in Feb 2025, where I was asked the following questions.
JPA (Java Persistence API) is a specification for managing relational data in Java applications using object-relational mapping.
JPA provides a way to map Java objects to database tables.
It simplifies database interactions through an object-oriented approach.
Common implementations include Hibernate, EclipseLink, and OpenJPA.
Example: Using JPA annotations like @Entity to define a persistent class.
JPA supports querying wi...
This program identifies and returns duplicate elements from a given list.
Use a set to track seen elements and a list for duplicates.
Iterate through the list and check if an element is in the set.
If it is, add it to the duplicates list; otherwise, add it to the set.
Example: For the list [1, 2, 3, 2, 4, 3], the output should be [2, 3].
I applied via Job Portal and was interviewed before Aug 2023. There was 1 interview round.
I am a data analyst with a strong background in statistics and data visualization.
Graduated with a degree in Statistics
Proficient in programming languages like Python and R
Experience in analyzing large datasets and creating data visualizations
Strong problem-solving skills
I applied via Referral and was interviewed in Sep 2021. There were 3 interview rounds.
posted on 27 Jun 2020
I applied via Recruitment Consultant and was interviewed in May 2020. There were 5 interview rounds.
I applied via Naukri.com and was interviewed in Mar 2021. There were 3 interview rounds.
Servlet and JSP life cycle involves initialization, request processing and destruction.
Servlet life cycle includes init(), service() and destroy() methods.
JSP life cycle includes translation, compilation, initialization, and request processing.
Servlet container manages the life cycle of servlets and JSPs.
Servlet and JSP objects are created and initialized during initialization phase.
During request processing phase, ser...
JDBC is a Java API for connecting to and interacting with databases.
JDBC stands for Java Database Connectivity.
It provides a standard interface for connecting to databases.
JDBC drivers are used to connect to specific databases.
JDBC can be used to execute SQL queries and retrieve results.
Example: Class.forName("com.mysql.jdbc.Driver"); Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb","userna
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