Interview Query

CoStar Group Interview Questions

IQ Team
Written by IQ Team
Jay Feng
Reviewed by Jay Feng
Published March 27, 2026
Estimated reading time: 5 minutes

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CoStar Group Interview Guides

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Data Structures & Algorithms
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SQL
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Machine Learning
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Probability
(30)
Statistics
(20)

CoStar Group Interview Questions

Practice for the CoStar Group interview with these recently asked interview questions.

QuestionTopicDifficulty
SQL
Easy

We’re given two tables, a users table with demographic information and the neighborhood they live in and a neighborhoods table.

Write a query that returns all neighborhoods that have 0 users. 

Example:

Input:

users table

Columns Type
id INTEGER
name VARCHAR
neighborhood_id INTEGER
created_at DATETIME

neighborhoods table

Columns Type
id INTEGER
name VARCHAR
city_id INTEGER

Output:

Columns Type
name VARCHAR
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SQL
Easy
SQL
Medium
SQL
Easy
Machine Learning
Medium
Statistics
Medium
SQL
Hard
Machine Learning
Medium
Python
Easy
Deep Learning
Hard
SQL
Medium
Statistics
Easy
Machine Learning
Hard

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CoStar Group Salaries by Position

Software Engineer
$100K
$180K
Software Engineer
Median: $125K
Mean (Average): $134K
Data points: 69
Data Engineer
$105K
$133K
Data Engineer
Median: $125K
Mean (Average): $122K
Data points: 14
Data Scientist*
$78K
$180K
Data Scientist
Median: $96K
Mean (Average): $115K
Data points: 4
Product Manager*
$91K
$114K
Product Manager
Median: $103K
Mean (Average): $103K
Data points: 2
Business Analyst*
$80K
$117K
Business Analyst
Median: $100K
Mean (Average): $99K
Data points: 4
Data Analyst
$65K
$92K
Data Analyst
Median: $75K
Mean (Average): $77K
Data points: 13
Base salary
Median
Mean (Average)
* = Low confidence (less than 5 data points)

Most data science positions fall under different position titles depending on the actual role.

From the graph we can see that on average the Software Engineer role pays the most with a $133,841 base salary while the Data Analyst role on average pays the least with a $77,474 base salary.

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