Analyze Recent Post Performance Using SQL Queries

Q: How do I practice SQL interview questions?

PracHub provides an interactive SQL console where you can write and test queries against real database schemas. Get instant feedback and compare your solution with the expected output.

Q: What difficulty level is this coding question?

This is a Medium difficulty Data Manipulation (SQL/Python) question, commonly asked during Technical Screen rounds at Meta.

Q: What role is this question designed for?

This question is commonly asked for Data Scientist candidates at Meta during technical interviews.

Question

INFO_STREAM_VIEWS

+---------+-----------+--------------+----------+------------+
| post_id | viewer_id | relationship | duration | ds         |
+---------+-----------+--------------+----------+------------+
| 1       | 101       | Friend       | 75.2     | 2023-08-10 |
| 1       | 102       | Unconnected  | 45.0     | 2023-08-10 |
| 2       | 103       | Followee     | 120.5    | 2023-08-11 |
| 3       | 104       | Unconnected  | 65.0     | 2023-08-11 |
| 4       | 105       | Friend       | 30.0     | 2023-08-12 |
+---------+-----------+--------------+----------+------------+

​

POST_REACTIONS

+---------+-----------+-------------+------------+
| post_id | viewer_id | post_action | ds         |
+---------+-----------+-------------+------------+
| 1       | 101       | like        | 2023-08-10 |
| 1       | 102       | comment     | 2023-08-10 |
| 2       | 103       | reshare     | 2023-08-11 |
| 3       | 104       | like        | 2023-08-11 |
| 3       | 104       | comment     | 2023-08-11 |
+---------+-----------+-------------+------------+

##### Scenario

Social-content feed needs SQL to report recent performance of posts.

##### Question

Q1. Write a query to count posts that received >60 seconds of viewing time from unconnected audiences in the last 7 days. Q2. Write a query to compute the average number of reactions per post coming from friends and from unconnected viewers in the last 7 days.

##### Hints

Leverage info_stream_views for watch-time filtering and join to post_reactions for reaction counts; window of CURRENT_DATE-6 to CURRENT_DATE.

PracHub · Accepted Answer

This question evaluates SQL-based data manipulation skills including joins, aggregation, temporal filtering, and audience segmentation to calculate viewing-time and reaction metrics.

Quick Overview

Analyze Recent Post Performance Using SQL Queries