10+ TD Power Systems Interview Questions and Answers

Use SQL query to find the second highest number in a given table

• Use the MAX() function to find the highest number in the table

• Use the WHERE clause to exclude the highest number from the result set

• Use the MAX() function again on the filtered result set to find the second highest number

SQL is a programming language used to manage and manipulate relational databases.

• Basic commands include SELECT, INSERT, UPDATE, DELETE, CREATE, and DROP.

• SELECT is used to retrieve data from a database.

• INSERT is used to add new data to a database.

• UPDATE is used to modify existing data in a database.

• DELETE is used to remove data from a database.

• CREATE is used to create a new database or table.

• DROP is used to delete a database or table.

The revenue recognition principle dictates when revenue should be recognized in financial statements.

• Revenue should be recognized when it is earned, regardless of when cash is received.

• Revenue is considered earned when goods or services are delivered or performed.

• The amount of revenue recognized should be the fair value of the goods or services exchanged.

• Revenue recognition can be complex, especially for long-term contracts or when there are uncertainties about collectability...read more

An index is a data structure that improves the speed of data retrieval operations in a database.

• Types of indexes include clustered index, non-clustered index, unique index, and composite index.

• Indexes can be created on one or multiple columns in a table.

• Indexes help in quickly locating data without having to scan the entire table.

• Examples of indexes are primary key indexes, foreign key indexes, and secondary indexes.

Data pipeline is a series of processes that collect, transform, and load data from various sources to a destination for analysis.

• Data ingestion: Collecting data from various sources like databases, APIs, logs, etc.

• Data processing: Cleaning, transforming, and enriching the data to make it usable for analysis.

• Data storage: Storing the processed data in a data warehouse, data lake, or other storage solutions.

• Data analysis: Analyzing the data to derive insights and make data-driv...read more

Excel is a spreadsheet program used for organizing, analyzing, and storing data in tabular format.

• Excel is part of Microsoft Office suite.

• It allows users to create tables, charts, graphs, and perform calculations.

• Data can be entered manually or imported from external sources.

• Formulas and functions can be used to manipulate data.

• Excel is commonly used for financial analysis, budgeting, and data visualization.

A microprocessor is a small electronic device that functions as the central processing unit of a computer.

• Microprocessors are made up of millions of tiny components like transistors and resistors.

• They execute instructions and perform calculations for various tasks.

• Examples of microprocessors include Intel's Core series and AMD's Ryzen series.

SCD stands for Slowly Changing Dimension, which is a concept used in data warehousing to track changes in data over time.

• SCD Type 1: Overwrites old data with new data, losing historical information.

• SCD Type 2: Keeps multiple versions of the same record, each with a different timestamp.

• SCD Type 3: Maintains separate columns for current and previous values, limiting historical data tracking.

• SCD Type 4: Uses separate history tables to store historical data.

• SCD Type 6: Combines f...read more

Polymorphism is the ability of a function or method to behave differently based on the object it is acting upon.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• It enables a single interface to represent multiple data types.

• Examples include method overloading and method overriding in object-oriented programming.

To work with words, one must have strong typing skills, attention to detail, and knowledge of data entry software.

• Practice typing regularly to improve speed and accuracy.

• Use spell check and grammar tools to ensure accuracy.

• Familiarize yourself with data entry software such as Microsoft Excel.

• Organize and prioritize tasks to efficiently input data.

• Double-check entries for errors before submitting.

• Seek feedback and training to improve skills.

• Example: Inputting customer informat...read more

Accounting principles are the fundamental guidelines and rules that govern the field of accounting.

• Accounting principles provide a framework for recording, analyzing, and reporting financial transactions.

• They ensure consistency, accuracy, and transparency in financial statements.

• Examples of accounting principles include the matching principle, revenue recognition principle, and the cost principle.

• These principles help in making informed financial decisions and assessing the f...read more