CoinDCX Data Analyst Interview Questions and Answers

Q1. What are the SQL commands can you explain it
Ans. 
SQL commands are used to interact with databases to perform various operations like querying, updating, and deleting data.
• SELECT: Retrieves data from a database

• INSERT INTO: Adds new records to a table

• UPDATE: Modifies existing records in a table

• DELETE: Removes records from a table

• CREATE TABLE: Creates a new table in the database

• ALTER TABLE: Modifies an existing table structure

• DROP TABLE: Deletes a table from the databas
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Q1. SQL, excel, python and power Bi
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Aptitude test was very easy

Q1. Based on resume
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Q2. Some simple hr questions
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Q1. About family and their occupations
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Q2. General questions
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SQL Test
3 questions for Solution using SQL queries.

Q1. SQL queries using window function
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Q2. Resume questions
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Q3. Past experience
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Q4. KPI that you have created
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It was a hybrid type of test it consisted of 3 sections
1. Aptitude
2. 2 DSA questions only the algorithm was to be written on the paper
3. 5 SQL queries (Intermediate level)

Q1. This was a one-to-one coding round medium-level dsa questions were asked.
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Q2. Find the minimum element in a stack in O(1) complexity
Ans. 
To find the minimum element in a stack in O(1) complexity, we can use an auxiliary stack.
• Create an auxiliary stack to keep track of the minimum element.

• Push the first element of the main stack onto the auxiliary stack.

• For each subsequent element, compare it with the top element of the auxiliary stack.

• If it is smaller, push it onto the auxiliary stack.

• To get the minimum element, simply return the top element of the auxi...read more
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Q1. In this round knowledge regarding SQL queries was tested.
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Q2. Fetch data without using subqueries instead use joins type of questions
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Q1. In this round real world problem was described and I was asked to develop a data analytics solution for the same.
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Basic quants test had to attend.

Basic Scenario based questions

Q1. Speak to speak< basic grammar corrections
Ans. 
The question is about basic grammar corrections.
• Always check for subject-verb agreement.

• Ensure proper use of punctuation marks.

• Review sentence structure for clarity and coherence.
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Q1. Project based question, ML, basic code
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