Big Data Architect Interview Questions
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Big Data Architect interview questions shared by candidates
linux systems how to write batch scripts which has nothing to do with big data Talk about redshift
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don't even bother with this company if you are not indian. I was treated good but the guy didn't like me because i looked middle eastern. I am certified with aws Associate & Professional and i also about to do my big data certification exam, and above all of that they told me i have no technical expertise with AWS, which thats is bulshit anyway dont bother with this company they waste your time. Less
SQL Assessment Questions: The data model below shows relationships between tables. You will need to understand these tables to develop SQL queries that answer the questions. All columns except Primary Key (PK) columns should be assumed to be nullable. Sample data for each of the tables (Sales, Product, SalesReturnReason) is shown below. A complete set of data is included in the attached Excel Spreadsheet. This spreadsheet data may be imported into your database of choice. Question 1 Write a SQL Query that will return the total amount of sales by product category, for the month of December 2013. • Your query should return 2 columns: ProductCategory, SalesAmount. • Your query should produce a 2-row result set, including the following row and 1 additional row that is not shown: Question 2 Write a SQL Query that returns the total amount of returns for reasons that were our fault (OurFault = “Y”) regardless of whether the items were physically returned (Returned = “Y”) • Your query should return one column: Sales. • Your query should produce a 1-row result set looking like the following: Question 3 Write a SQL Query that will show total sales for the top 4 product subcategories, including ties (see note below) based on 2013 sales. • A NULL ProductSubCategory should be listed as “Unknown”. • In the event of a tie within the top 4, both records should be included. • Your query should return 3 columns: ProductSubCategory, Sales and SalesRank. • Your query should produce a 4-row result set including the following 2 records and 2 additional rows that are not shown: Question 4 Write a SQL Query that will show all transactions where a customer purchased a Hydration Pack (ProductSubCategory = " Hydration Packs") and their previous purchase -- based on TransactionTimestamp -- was a Water Bottle or Cage (ProductSubCategory = "Bottles and Cages"). • Your query should return 6 columns: TransactionID, CustomerName, ProductSubCategory, PriorProductSubCategory, TransactionTimestamp, and SalesAmount. • Your query should produce a 3 row result set that includes these 2-rows and 1 additional row that is not shown: Question 5 Write a SQL Query that will return total sales by product category and year. • Write the SQL query without using a CASE statement • A NULL ProductCategory should be listed as “Unknown”. • Your query should return 4 columns: ProductCategory, 2012, 2013, and 2014. Each of the year columns will show the total sales amount for that year. • Your query should produce a 4-row result set including the 2 rows below, and 2 additional rows that are not shown:
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Answer 1 SELECT Product.ProductCategory, SUM(Sales.SalesAmount) AS SalesAmount FROM Sales LEFT OUTER JOIN Product ON Sales.ProductID = Product.ProductID WHERE Product.ProductCategory IS NOT NULL AND (MONTH(Sales.TransactionTimestamp) = 12) AND (YEAR(Sales.TransactionTimestamp) = 2013) GROUP BY Product.ProductCategory Answer 2 SELECT SUM(Sales.SalesAmount) AS Sales FROM Sales WHERE Sales.TransactionID IN (SELECT DISTINCT SalesReturnReason.TransactionID FROM SalesReturnReason WHERE SalesReturnReason.OurFault = 'Y') Answer 3 SELECT TOP 4 CASE WHEN Product .ProductSubCategory IS NULL THEN 'Unknown' ELSE Product .ProductSubCategory END AS ProductSubCategory, SUM(dbo.Sales.SalesAmount) AS Sales, RANK() OVER (ORDER BY SUM(Sales.SalesAmount) DESC) AS Rank FROM Product LEFT OUTER JOIN Sales ON Product.ProductID = Sales.ProductID WHERE (YEAR(Sales.TransactionTimestamp) = 2013) GROUP BY Product.ProductSubCategory ORDER BY SUM(Sales.SalesAmount) DESC Answer 4 SELECT Sales.TransactionID, Customer.CustomerName, Product.ProductSubCategory, (SELECT TOP (1) PriorProduct.ProductSubCategory AS PriorProductSubCategory FROM Sales AS PriorSales LEFT OUTER JOIN Product AS PriorProduct ON PriorSales.ProductID = PriorProduct.ProductID WHERE PriorSales.CustomerID = Sales.CustomerID AND PriorSales.TransactionTimestamp < Sales.TransactionTimestamp ORDER BY PriorSales.TransactionTimestamp DESC) AS PriorProductSubCategory, Sales.TransactionTimestamp, Sales.SalesAmount FROM Sales LEFT OUTER JOIN Product ON Sales.ProductID = dbo.Product.ProductID LEFT OUTER JOIN Customer ON Sales.CustomerID = Customer.CustomerID WHERE Product.ProductSubCategory = 'Hydration Packs' AND (SELECT TOP (1) PriorProduct.ProductSubCategory AS PriorProductSubCategory FROM Sales AS PriorSales LEFT OUTER JOIN Product AS PriorProduct ON PriorSales.ProductID = PriorProduct.ProductID WHERE PriorSales.CustomerID = Sales.CustomerID AND PriorSales.TransactionTimestamp < Sales.TransactionTimestamp ORDER BY PriorSales.TransactionTimestamp DESC) = 'Bottles and Cages' ORDER BY Customer.CustomerID ASC Answer 5 SELECT COALESCE (ProductCategory, 'Unknown') AS ProductCategory, COALESCE ((SELECT SUM(Sales2012.SalesAmount) AS '2012' FROM Sales AS Sales2012 LEFT OUTER JOIN Product AS Product2012 ON Sales2012.ProductID = Product2012.ProductID WHERE YEAR(Sales2012.TransactionTimestamp) = 2012 AND COALESCE (Product2012.ProductCategory, 'Unknown') = COALESCE (dbo.Product.ProductCategory, 'Unknown')), 0) AS '2012', COALESCE ((SELECT SUM(Sales2013.SalesAmount) AS '2013' FROM Sales AS Sales2013 LEFT OUTER JOIN Product AS Product2013 ON Sales2013.ProductID = Product2013.ProductID WHERE YEAR(Sales2013.TransactionTimestamp) = 2013 AND COALESCE (Product2013.ProductCategory, 'Unknown') = COALESCE (dbo.Product.ProductCategory, 'Unknown')), 0) AS '2013', COALESCE ((SELECT SUM(Sales2014.SalesAmount) AS '2014' FROM Sales AS Sales2014 LEFT OUTER JOIN Product AS Product2014 ON Sales2014.ProductID = Product2014.ProductID WHERE YEAR(Sales2014.TransactionTimestamp) = 2014 AND COALESCE (Product2014.ProductCategory, 'Unknown') = COALESCE (dbo.Product.ProductCategory, 'Unknown')), 0) AS '2014' FROM Product GROUP BY ProductCategory ORDER BY ProductCategory Less
What would you do when facing a situation where you did most of the work and then someone suddenly took all the credit during a meeting with the client?
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I would appreciate the individual who took credit of my credibility and would request the individual to share the experience how he achieved it to the forum. Would like to react on the variation in the approach how he did once I receive his response. Less