Amazon Business Analyst Interview Questions and Answers

CASE in SQL is used to apply conditional logic to queries and manipulate data based on specific conditions.

• CASE is used to create conditional expressions in SQL

• It allows for the manipulation of data based on specific conditions

• CASE can be used in SELECT, WHERE, and ORDER BY clauses

• It can be used to create calculated fields or to filter data based on specific criteria

• CASE can also be used in conjunction with aggregate functions like SUM and COUNT

• Example: SELECT name, CASE WHEN...read more

Yes, I have knowledge on Aspect WFO and SQL.

• I have experience working with Aspect Workforce Optimization (WFO) software.

• I am proficient in writing and executing SQL queries for data analysis and reporting.

• I have used SQL to extract and manipulate data from databases for business analysis purposes.

Using Window Function, Date and Time in a complex SQL query

• Use ROW_NUMBER() to assign a unique number to each row within a partition

• Use PARTITION BY to divide the result set into partitions

• Use ORDER BY to specify the order of rows within each partition

• Utilize functions like LAG(), LEAD(), SUM(), AVG(), etc. within the window frame

I rate myself as proficient in SQL with experience in writing complex queries and optimizing database performance.

• Proficient in writing complex SQL queries

• Experience in optimizing database performance

• Familiar with database management systems like MySQL, SQL Server, Oracle

• Ability to work with large datasets and perform data analysis

• Knowledge of SQL functions, joins, subqueries, and indexes

Different types of Joins are Inner Join, Left Join, Right Join, and Full Join.

• Inner Join: Returns rows when there is a match in both tables.

• Left Join: Returns all rows from the left table and the matched rows from the right table.

• Right Join: Returns all rows from the right table and the matched rows from the left table.

• Full Join: Returns rows when there is a match in one of the tables.