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ACI Worldwide is hiring for Software Engineer
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๐ŸŽฏ Practice Questions

1. Create a list of numbers from 1 to 20.

2. Create a list containing the squares of numbers from 1 to 10.

3. Create a list containing only odd numbers from 1 to 20.

4. Convert a list of names to lowercase.

5. Replace all negative values in a list with zero using a list comprehension.

๐ŸŽฏ Key Takeaways

โœ… List comprehensions provide a concise way to create lists.

โœ… They combine loops and expressions into a single line.

โœ… You can filter data using "if" conditions.

โœ… Conditional expressions allow values to be modified during list creation.

โœ… List comprehensions are widely used in data cleaning, feature engineering, and machine learning workflows.

Mastering list comprehensions will help you write cleaner, more Pythonic code and prepare you for technical interviews and real-world Data Science projects.

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MemSlides: A Hierarchical Memory Driven Agent Framework for Personalized Slide Generation with Multi-turn Local Revision

๐Ÿ“… Publication Date: Jun 15, 2026

๐Ÿ“‘ Paper: https://arxiv.org/pdf/2606.17162.pdf

๐Ÿ”— Code: https://github.com/huggingface

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Orca: The World is in Your Mind

๐Ÿ“… Publication Date: Jun 29, 2026

๐Ÿ“‘ Paper: https://arxiv.org/pdf/2606.30534.pdf

๐Ÿ”— Code: https://github.com/huggingface

๐Ÿ“ Description:

Orca establishes a unified world latent space through next-state-prediction modeling using multimodal data and demonstrates superior performance in downstream tasks compared to specialized baselines.Debugging processes across container boundaries on Kubernetes

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Every serious data analyst or backend dev should master these.

Letโ€™s break them down with clarity:

๐—œ๐—ก๐—ก๐—˜๐—ฅ ๐—๐—ข๐—œ๐—ก
โ†’ Returns only the rows with matching keys in both tables
โ†’ Think of it as intersection
๐—˜๐˜…๐—ฎ๐—บ๐—ฝ๐—น๐—ฒ:
Customers who have placed at least one order

SELECT *
FROM Customers
INNER JOIN Orders
ON Customers.ID = Orders.CustomerID;

๐—Ÿ๐—˜๐—™๐—ง ๐—๐—ข๐—œ๐—ก (๐—ข๐—จ๐—ง๐—˜๐—ฅ)
โ†’ Returns all rows from the left table + matching rows from the right
โ†’ If no match, right side = NULL
๐—˜๐˜…๐—ฎ๐—บ๐—ฝ๐—น๐—ฒ:
List all customers, even if theyโ€™ve never ordered

SELECT *
FROM Customers
LEFT JOIN Orders
ON Customers.ID = Orders.CustomerID;

๐—ฅ๐—œ๐—š๐—›๐—ง ๐—๐—ข๐—œ๐—ก (๐—ข๐—จ๐—ง๐—˜๐—ฅ)
โ†’ Returns all rows from the right table + matching rows from the left
โ†’ Rarely used, but similar logic
๐—˜๐˜…๐—ฎ๐—บ๐—ฝ๐—น๐—ฒ:
All orders, even from unknown or deleted customers

SELECT *
FROM Customers
RIGHT JOIN Orders
ON Customers.ID = Orders.CustomerID;

๐—™๐—จ๐—Ÿ๐—Ÿ ๐—ข๐—จ๐—ง๐—˜๐—ฅ ๐—๐—ข๐—œ๐—ก
โ†’ Returns all records when thereโ€™s a match in either table
โ†’ Unmatched rows = NULLs
๐—˜๐˜…๐—ฎ๐—บ๐—ฝ๐—น๐—ฒ:
Show all customers and all orders, whether matched or not

SELECT *
FROM Customers
FULL OUTER JOIN Orders
ON Customers.ID = Orders.CustomerID;

๐—–๐—ฅ๐—ข๐—ฆ๐—ฆ ๐—๐—ข๐—œ๐—ก
โ†’ Returns Cartesian product (all combinations)
โ†’ Use with care. 1,000 x 1,000 rows = 1,000,000 results!
๐—˜๐˜…๐—ฎ๐—บ๐—ฝ๐—น๐—ฒ:
Show all possible product and supplier pairings

SELECT *
FROM Products
CROSS JOIN Suppliers;

๐—ฆ๐—˜๐—Ÿ๐—™ ๐—๐—ข๐—œ๐—ก
โ†’ Join a table to itself
โ†’ Used for hierarchical data like employees & managers
๐—˜๐˜…๐—ฎ๐—บ๐—ฝ๐—น๐—ฒ:
Find each employeeโ€™s manager

SELECT A.Name AS Employee, B.Name AS Manager
FROM Employees A
JOIN Employees B
ON A.ManagerID = B.ID;

๐—•๐—ฒ๐˜€๐˜ ๐—ฃ๐—ฟ๐—ฎ๐—ฐ๐˜๐—ถ๐—ฐ๐—ฒ๐˜€
โ†’ Always use aliases (A, B) to simplify joins
โ†’ Use JOIN ON instead of WHERE for better clarity
โ†’ Test each join with LIMIT first to avoid surprises

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