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Amazon Business Analyst Interview Questions and Answers
Q1. Use of case in SQL why and when we use it.
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
Q2. Do you have knowledge on Aspect WFO and SQL?
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.
Q3. complex SQL query - using Window Function, Date and Time
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
Q4. How would you rate yourself in SQL
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
Q5. Different types of Joins
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.
Q6. Different joins in sql
Different types of joins in SQL include inner join, left join, right join, and full outer 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 outer join: Returns all rows when there is a match in either table
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