10+ Wells Fargo Interview Questions and Answers

PLSQL is a procedural extension of SQL used in Oracle databases for writing stored procedures and functions.

• Main components: variables, control structures, cursors, exceptions

• Variables: used to store data within PLSQL programs

• Control structures: used for conditional logic and looping

• Cursors: used to process individual rows returned by SQL queries

• Exceptions: used for error handling and custom error messages

Types of clauses in SQL include SELECT, WHERE, GROUP BY, HAVING, ORDER BY, JOIN, etc.

• SELECT: Retrieves data from a database

• WHERE: Filters records based on specified conditions

• GROUP BY: Groups rows that have the same values into summary rows

• HAVING: Filters groups based on specified conditions

• ORDER BY: Sorts the result set in ascending or descending order

• JOIN: Combines rows from two or more tables based on a related column

You can restrict the value for a particular button pressed from the keyboard by using event listeners and conditionals in your code.

• Use event listeners to detect when a key is pressed on the keyboard

• Check the value of the key pressed and only allow the desired button to trigger an action

• You can use if statements or switch cases to restrict the value for a particular button pressed

Yes, machine learning is a branch of artificial intelligence that focuses on developing algorithms and models that allow computers to learn from and make predictions or decisions based on data.

• Machine learning involves training algorithms to recognize patterns in data and make predictions or decisions without being explicitly programmed.

• Common machine learning techniques include supervised learning, unsupervised learning, and reinforcement learning.

• Examples of machine learnin...read more

SAP is a software company that provides enterprise resource planning solutions to businesses.

• SAP stands for Systems, Applications, and Products in Data Processing

• It offers a range of software solutions for various business functions like finance, HR, supply chain management, etc.

• SAP ERP (Enterprise Resource Planning) system helps businesses streamline their processes and improve efficiency

• SAP also offers cloud-based solutions like SAP S/4HANA for digital transformation

• SAP con...read more

Triggers are database objects that automatically perform an action when a specified event occurs.

• Triggers are used to maintain data integrity by enforcing business rules or referential integrity.

• They can be used to audit changes to data, such as tracking who made a change and when.

• Triggers can also be used to replicate data changes to other tables or systems.

• Examples include triggering a notification when a new record is inserted, or updating a related table when a record is ...read more

A package in PL/SQL is a collection of related procedures, functions, variables, and other PL/SQL constructs.

• Packages help organize and encapsulate code for easier maintenance and reuse.

• They consist of a specification (header) and a body.

• Packages can contain procedures, functions, variables, constants, cursors, and exceptions.

• Example: CREATE PACKAGE my_package AS PROCEDURE my_procedure; END my_package;

• Example: CREATE PACKAGE BODY my_package AS PROCEDURE my_procedure IS BEGIN ...read more

OOPs concepts are the principles of Object-Oriented Programming that help in designing and implementing software systems.

• Encapsulation - bundling of data and methods that operate on that data

• Inheritance - ability of a class to inherit properties and characteristics from a parent class

• Polymorphism - ability of an object to take on many forms

• Abstraction - hiding the implementation details and showing only the functionality

• Example: A car is an object that has properties like col...read more

Abstraction program hides implementation details and shows only necessary information.

• Abstraction is a way to achieve data hiding and encapsulation

• It helps in reducing complexity and increases efficiency

• Example: A car dashboard shows only necessary information like speed, fuel level, etc. and hides the implementation details of the engine

• Abstraction can be achieved through abstract classes and interfaces

Delta Lake is an open-source storage layer that brings ACID transactions to Apache Spark and big data workloads.

• Delta Lake provides ACID transactions, schema enforcement, and time travel capabilities on top of data lakes.

• Data lake is a storage repository that holds a vast amount of raw data in its native format until it is needed.

• Delta Lake ensures data reliability and data quality by providing ACID transactions.

• Data lake lacks ACID transactions and schema enforcement, making...read more

ECC is the traditional ERP system while S4 HANA is the next-generation ERP system with in-memory computing and real-time analytics.

• ECC is based on a traditional RDBMS while S4 HANA uses in-memory computing with SAP HANA database

• S4 HANA offers real-time analytics and predictive capabilities, while ECC does not

• S4 HANA simplifies data models and processes, enabling faster decision-making and innovation

• ECC requires separate systems for transactional and analytical processing, whi...read more