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1. How do you retrieve all columns from a table?

SELECT * FROM table_name;


2. What SQL statement is used to filter records?

SELECT * FROM table_name
WHERE condition;

The WHERE clause is used to filter records based on a specified condition.


3. How can you join multiple tables? Describe different types of JOINs.

SELECT columns
FROM table1
JOIN table2 ON table1.column = table2.column
JOIN table3 ON table2.column = table3.column;

Types of JOINs:

1. INNER JOIN: Returns records with matching values in both tables

SELECT * FROM table1
INNER JOIN table2 ON table1.column = table2.column;

2. LEFT JOIN (or LEFT OUTER JOIN): Returns all records from the left table and matched records from the right table. Unmatched records will have NULL values.

SELECT * FROM table1
LEFT JOIN table2 ON table1.column = table2.column;

3. RIGHT JOIN (or RIGHT OUTER JOIN): Returns all records from the right table and matched records from the left table. Unmatched records will have NULL values.

SELECT * FROM table1
RIGHT JOIN table2 ON table1.column = table2.column;

4. FULL JOIN (or FULL OUTER JOIN): Returns records when there is a match in either left or right table. Unmatched records will have NULL values.

SELECT * FROM table1
FULL JOIN table2 ON table1.column = table2.column;


4. What is the difference between WHERE and HAVING clauses?

WHERE: Filters records before any groupings are made.

SELECT * FROM table_name
WHERE condition;

HAVING: Filters records after groupings are made.

SELECT column, COUNT(*)
FROM table_name
GROUP BY column
HAVING COUNT(*) > value;


5. How do you count the number of records in a table?

SELECT COUNT(*) FROM table_name;

This query counts all the records in the specified table.

6. How do you calculate average, sum, minimum, and maximum values in a column?

Average: SELECT AVG(column_name) FROM table_name;

Sum: SELECT SUM(column_name) FROM table_name;

Minimum: SELECT MIN(column_name) FROM table_name;

Maximum: SELECT MAX(column_name) FROM table_name;


7. What is a subquery, and how do you use it?

Subquery: A query nested inside another query

SELECT * FROM table_name
WHERE column_name = (SELECT column_name FROM another_table WHERE condition);




Till then keep learning and keep exploring 🙌

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Your resume is your first impression — make it clear, concise, and confident with these tips:

1. Keep It One Page (for beginners)
⦁ Recruiters spend 6–10 seconds glancing through.
⦁ Use crisp bullet points, no long paragraphs.
⦁ Focus on relevant data science experience.

2. Strong Summary at the Top 
Example: 
“Aspiring Data Scientist with hands-on experience in Python, Pandas, and Machine Learning. Built 5+ real-world projects including house price prediction and sentiment analysis.”

3. Highlight Technical Skills 
Separate Skills section:
⦁ Languages: Python, SQL
⦁ Libraries: Pandas, NumPy, Matplotlib, Scikit-learn
⦁ Tools: Jupyter, VS Code, Git, Tableau
⦁ Concepts: EDA, Regression, Classification, Data Cleaning

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Each project: 2–3 bullet points
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⦁ “Cleaned & visualized 10K+ rows of sales data with Pandas & Seaborn.” 
  Include GitHub links.

5. Education & Certifications 
Include:
⦁ Degree (any field)
⦁ Online certifications (Coursera, Kaggle, etc.)
⦁ Mention course projects or capstones

6. Quantify Everything 
Instead of “Analyzed data”, write: 
“Analyzed 20K+ customer rows to identify churn factors, improving model performance by 12%.”

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Advanced Projects

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The key to success isn't hoarding every tutorial and course.
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Where to begin?

Then my mentor gave me one piece of advice:

"Stop planning. Start doing.
Pick the shortest video you can find.
Watch it. Now."

It was tough love, but it worked.

I chose a 3-minute intro to pandas.
Then a quick matplotlib demo.
Suddenly, I was building momentum.

Each bite-sized lesson built my confidence.
Every "I did it!" moment sparked joy.
I was no longer overwhelmed—I was excited.

So here's my advice for you:

1. Find a 5-minute data science video. Any topic.
2. Watch it before you finish your coffee.
3. Do one thing you learned. Anything.

Remember:
A messy start beats a perfect plan
Every. Single. Time.

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