Frederik Müller

@UCuDWqzSSHgHkD0zBwrIXSNQ - 14.4K subscribers

I'm a Data Scientist giving interview preparation tips including solutions to LeetCode and StrataScratch problems.

Home Videos Live Playlists

HARD Uber SQL Interview Question: Maximum Number of Employees Reached (StrataScratch 2046)

HARD Uber SQL Interview Question: Maximum Number of Employees Reached (StrataScratch 2046) Frederik Müller

814 views - 1 year ago

HARD Apple/Microsoft SQL Interview Question: New And Existing Users (StrataScratch 2028)

HARD Apple/Microsoft SQL Interview Question: New And Existing Users (StrataScratch 2028) Frederik Müller

575 views - 1 year ago

HARD Meta SQL Interview Question: Rank Variance Per Country (StrataScratch 2007)

HARD Meta SQL Interview Question: Rank Variance Per Country (StrataScratch 2007) Frederik Müller

719 views - 1 year ago

HARD Amazon SQL Interview Question: Marketing Campaign Success [Advanced] (StrataScratch 514)

HARD Amazon SQL Interview Question: Marketing Campaign Success [Advanced] (StrataScratch 514) Frederik Müller

1K views - 1 year ago

LeetCode 1321: Restaurant Growth [SQL]

LeetCode 1321: Restaurant Growth [SQL] Frederik Müller

3.2K views - 1 year ago

LeetCode 585: Investments in 2016 [SQL]

LeetCode 585: Investments in 2016 [SQL] Frederik Müller

1.7K views - 1 year ago

LeetCode 602: Friend Requests II: Who Has the Most Friends [SQL]

LeetCode 602: Friend Requests II: Who Has the Most Friends [SQL] Frederik Müller

1.6K views - 1 year ago

LeetCode 1517: Find Users With Valid E-Mails [SQL]

LeetCode 1517: Find Users With Valid E-Mails [SQL] Frederik Müller

2.4K views - 1 year ago

LeetCode 1327: List the Products Ordered in a Period [SQL]

LeetCode 1327: List the Products Ordered in a Period [SQL] Frederik Müller

799 views - 1 year ago

LeetCode 1484: Group Sold Products By The Date [SQL]

LeetCode 1484: Group Sold Products By The Date [SQL] Frederik Müller

1.1K views - 1 year ago

LeetCode 1527: Patients With a Condition [SQL]

LeetCode 1527: Patients With a Condition [SQL] Frederik Müller

874 views - 1 year ago

LeetCode 1667: Fix Names in a Table [SQL]

LeetCode 1667: Fix Names in a Table [SQL] Frederik Müller

909 views - 1 year ago

LeetCode 1341: Movie Rating [SQL]

LeetCode 1341: Movie Rating [SQL] Frederik Müller

1.7K views - 1 year ago

LeetCode 1164: Product Price at a Given Date [SQL]

LeetCode 1164: Product Price at a Given Date [SQL] Frederik Müller

3.1K views - 1 year ago

LeetCode 1789: Primary Department for Each Employee [SQL]

LeetCode 1789: Primary Department for Each Employee [SQL] Frederik Müller

1.6K views - 1 year ago

LeetCode 1731: The Number of Employees Which Report to Each Employee [SQL]

LeetCode 1731: The Number of Employees Which Report to Each Employee [SQL] Frederik Müller

1.5K views - 1 year ago

LeetCode 1045: Customers Who Bought All Products [SQL]

LeetCode 1045: Customers Who Bought All Products [SQL] Frederik Müller

1.4K views - 1 year ago

LeetCode 619: Biggest Single Number [SQL]

LeetCode 619: Biggest Single Number [SQL] Frederik Müller

1.2K views - 1 year ago

LeetCode 1729: Find Followers Count [SQL]

LeetCode 1729: Find Followers Count [SQL] Frederik Müller

710 views - 1 year ago

LeetCode 1141: User Activity for the Past 30 Days I

LeetCode 1141: User Activity for the Past 30 Days I Frederik Müller

1.7K views - 1 year ago

LeetCode 1174: Immediate Food Delivery II

LeetCode 1174: Immediate Food Delivery II Frederik Müller

3K views - 1 year ago

LeetCode 1193: Monthly Transactions I

LeetCode 1193: Monthly Transactions I Frederik Müller

2K views - 1 year ago

LeetCode 1211: Queries Quality and Percentage

LeetCode 1211: Queries Quality and Percentage Frederik Müller

2K views - 1 year ago

LeetCode 1075: Project Employees I

LeetCode 1075: Project Employees I Frederik Müller

1K views - 1 year ago

LeetCode 1251: Average Selling Price

LeetCode 1251: Average Selling Price Frederik Müller

3.3K views - 1 year ago

LeetCode 1280: Students and Examinations

LeetCode 1280: Students and Examinations Frederik Müller

5.9K views - 1 year ago

LeetCode 1378: Replace Employee ID With The Unique Identifier

LeetCode 1378: Replace Employee ID With The Unique Identifier Frederik Müller

6.3K views - 1 year ago

*HARD* IBM SQL Interview Question (StrataScratch 10538)

*HARD* IBM SQL Interview Question (StrataScratch 10538) Frederik Müller

1K views - 2 years ago

LeetCode 1907: Count Salary Categories [SQL]

LeetCode 1907: Count Salary Categories [SQL] Frederik Müller

2.2K views - 2 years ago

LeetCode 1683: Invalid Tweets [SQL]

LeetCode 1683: Invalid Tweets [SQL] Frederik Müller

2.5K views - 2 years ago

LeetCode 584: Find Customer Referee [SQL]

LeetCode 584: Find Customer Referee [SQL] Frederik Müller

3.7K views - 2 years ago

LeetCode 1148: Article Views I [SQL]

LeetCode 1148: Article Views I [SQL] Frederik Müller

3.3K views - 2 years ago

LeetCode 1581: Customer Who Visited but Did Not Make Any Transactions [SQL]

LeetCode 1581: Customer Who Visited but Did Not Make Any Transactions [SQL] Frederik Müller

6.3K views - 2 years ago

LeetCode 1978: Employees Whose Manager Left the Company [SQL]

LeetCode 1978: Employees Whose Manager Left the Company [SQL] Frederik Müller

1.5K views - 2 years ago

LeetCode 2356: Number of Unique Subjects Taught by Each Teacher [SQL]

LeetCode 2356: Number of Unique Subjects Taught by Each Teacher [SQL] Frederik Müller

1.4K views - 2 years ago

LeetCode 1934: Confirmation Rate [SQL]

LeetCode 1934: Confirmation Rate [SQL] Frederik Müller

5.4K views - 2 years ago

*HARD* Walmart SQL Interview Question (StrataScratch 9900: Median Salary)

*HARD* Walmart SQL Interview Question (StrataScratch 9900: Median Salary) Frederik Müller

1.4K views - 2 years ago

*HARD* Microsoft SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10300)

*HARD* Microsoft SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10300) Frederik Müller

1.2K views - 2 years ago

*HARD* Apple SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2029)

*HARD* Apple SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2029) Frederik Müller

1.8K views - 2 years ago

Salesforce SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 9905)

Salesforce SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 9905) Frederik Müller

1.3K views - 2 years ago

*HARD* Meta/Facebook SQL Interview Question for Data Scientists/Analysts (StrataScratch 10297)

*HARD* Meta/Facebook SQL Interview Question for Data Scientists/Analysts (StrataScratch 10297) Frederik Müller

3.2K views - 2 years ago

*HARD* Amazon SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10314)

*HARD* Amazon SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10314) Frederik Müller

1.8K views - 2 years ago

Tesla SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10318)

Tesla SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10318) Frederik Müller

2.6K views - 2 years ago

TikTok ByteDance SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2145)

TikTok ByteDance SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2145) Frederik Müller

4.3K views - 2 years ago

Starbucks SQL Interview Question for Data Scientists and Data Analysts (StrataScratch9867)

Starbucks SQL Interview Question for Data Scientists and Data Analysts (StrataScratch9867) Frederik Müller

1K views - 2 years ago

Tata Consultancy Services SQL Interview Question (StrataScratch 2144)

Tata Consultancy Services SQL Interview Question (StrataScratch 2144) Frederik Müller

3.2K views - 2 years ago

NVIDIA SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10163)

NVIDIA SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10163) Frederik Müller

1.1K views - 2 years ago

Google SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10351)

Google SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10351) Frederik Müller

1.3K views - 2 years ago

SQL Window Functions Tutorial | Window Functions in SQL

SQL Window Functions Tutorial | Window Functions in SQL Frederik Müller

1.7K views - 3 years ago

The Difference Between WHERE and HAVING | WHERE vs. HAVING in SQL

The Difference Between WHERE and HAVING | WHERE vs. HAVING in SQL Frederik Müller

3.2K views - 3 years ago

Shopify SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2118)

Shopify SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2118) Frederik Müller

3.5K views - 3 years ago

*HARD* Twitch SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2012)

*HARD* Twitch SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2012) Frederik Müller

1.8K views - 3 years ago

Another Meta / Facebook SQL Interview Question for Data Scientists / Analysts (StrataScratch 2086)

Another Meta / Facebook SQL Interview Question for Data Scientists / Analysts (StrataScratch 2086) Frederik Müller

2.5K views - 3 years ago

Another Google SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2098)

Another Google SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2098) Frederik Müller

2.6K views - 3 years ago

Another Airbnb SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 9636)

Another Airbnb SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 9636) Frederik Müller

2K views - 4 years ago

Instacart SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2087)

Instacart SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2087) Frederik Müller

4.1K views - 4 years ago

DoorDash SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2035)

DoorDash SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2035) Frederik Müller

5.9K views - 4 years ago

*HARD* Netflix SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10303)

*HARD* Netflix SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 10303) Frederik Müller

3.7K views - 4 years ago

Twitch SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2010)

Twitch SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 2010) Frederik Müller

2K views - 4 years ago

Dropbox SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 9894)

Dropbox SQL Interview Question for Data Scientists and Data Analysts (StrataScratch 9894) Frederik Müller

1.9K views - 4 years ago