Common Window Functions: RANK() – Assigns ranking with gaps. DENSE_RANK() – Assigns ranking without gaps. LEAD() & LAG() – Access next or previous row values. SUM() OVER() – Calculates running totals. Window functions are essential for analytical queries without impacting row structure. ...
38. What are the TRUNCATE, DELETE and DROP statements? 39. What is the difference between DROP and TRUNCATE statements? 40. What is the difference between DELETE and TRUNCATE statements? 41. What are Aggregate and Scalar functions? PostgreSQL Interview Questions SQL MCQ Learn...
Analytical Functions-NTH,LISTAGG: Oracle 11 G specifies two new aggregate functions: 1.LISTAGG: LISTAGG aggregates a column values in a single row format. 2.NTH_VALUE: NTH_VALUE is an extended format of FIRST_VALUE and LAST_VALUE functions to get a random row from a grouped result set. S...
Functions with a scalar type operate on and return a single value. Key Upshots T-SQL is derived from SQL, whereas SQL is a foundation programming language. The requirements of your project will determine which database to use. MSBI Quiz Questions Warm up your Interview preparation with us. T...
12. What analytical techniques are offered by Apache Spark GraphX? The API for graphs and graph-parallel integer arithmetic in Apache Spark is called GraphX. To make analytics tasks simpler, GraphX includes a collection of graph algorithms. The algorithms can be directly accessed as methods on ...
Additionally, I've leveraged Power BI's advanced features, such as DAX expressions and data modeling, to create robust analytical solutions that meet stakeholders' specific needs. Additionally, in my previous role at [Company], I leveraged Tableau to create visualizations for [Insert relevant project...
Sure, they need diverse skills such as data visualization, analytical mindset, communication, and business intelligence. But to make the most out of those skills, they have to handle and analyze data somehow. Working with large data sets requires knowledge of a programming language or two. The ...
For people with strong communication skills, analytical and critical thinking, and problem-solving skills, being an SQL developer can pave the way to career success. The information technology industry keeps on changing which means it will be a lifelong learning and continual skill upgrade which ...
DuckDB combines the simplicity and ease of use of SQLite with the analytical performance of specialized columnar databases. Learn more with Python examples. SQL In-Database Analytics: Leveraging SQL’s Analytic Functions- Jul 3, 2023. Learn about various SQL Analytic functions like RANK(), NTILE(...
A basic understanding of ranking functions is critical to getting the most out of performing analytical queries and acing that upcoming interview. Most data professionals might be able to provide a use case for ROW_NUMBER(), but what about the differences between RANK() and DENSE_RANK()? Also...