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Z1 Tech Data Analyst Interview Questions and Answers
Z1 Tech Data Analyst Interview Experiences
1 interview found
I applied via Naukri.com and was interviewed in May 2024. There were 2 interview rounds.
(2 Questions)
- Q1. Questions on vlook up, h-look up, pivot and if else condition
- Q2. You must know how to use vlook up, h-look up and if-else condition
Excel file was give, used sumifs, countifs , index match formulas
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Interview questions from similar companies
Selected
I applied via LinkedIn and was interviewed before Aug 2023. There were 2 interview rounds.
(2 Questions)
- Q1. Difference between union and union all in SQL?
- Ans.
Union combines and removes duplicates, Union All combines without removing duplicates.
Union combines result sets and removes duplicates
Union All combines result sets without removing duplicates
Union is slower than Union All as it involves removing duplicates
Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;
Example: SELECT column1 FROM table1 UNION ALL SELECT column1 FROM table2;
- Q2. How to show top 5 in pandas?
- Ans.
To show top 5 in pandas, use the nlargest() function.
Use the nlargest() function with the 'n' parameter set to 5 to get the top 5 values in a pandas DataFrame.
For example: df['column_name'].nlargest(5) will return the top 5 values in the specified column.
(1 Question)
- Q1. If we have 3 numerical columns, which chart is a better representation these column?
- Ans.
A scatter plot is a better representation for 3 numerical columns.
Use a scatter plot to show the relationship between the numerical columns.
Scatter plots are effective for visualizing correlations and patterns in data.
Each point on the plot represents a data point with values from all 3 columns.
Interview Preparation Tips
- SQL Server
- Pandas
- Power Bi
Skills evaluated in this interview
I applied via Campus Placement and was interviewed in May 2022. There were 2 interview rounds.
Basic general English language
Basic question
Interview Preparation Tips
Selected
I appeared for an interview before Mar 2024.
(2 Questions)
- Q1. About datorama explain how it works
- Q2. More about digital marketing
I applied via Referral and was interviewed in Nov 2021. There was 1 interview round.
Interview Questionnaire
4 Questions
- Q1. Difference between coalesce and repartition
- Ans.
Coalesce is used to select the first non-null value from a set of columns. Repartition is used to shuffle data across nodes.
Coalesce reduces the number of partitions to the minimum required.
Repartition increases or decreases the number of partitions.
Coalesce is a narrow transformation while repartition is a wide transformation.
Coalesce is used to optimize data for queries while repartition is used to balance data acros...
- Q2. How to optimise joins
- Ans.
Optimizing joins involves selecting appropriate join types, indexing tables, and minimizing data movement.
Choose the appropriate join type based on the size and structure of the tables being joined
Index the tables on the join columns to speed up the join process
Minimize data movement by selecting only the necessary columns and filtering rows before joining
Consider using denormalization or materialized views to precompu
- Q3. Spark optimizations
- Q4. Difference between RDD dataset and dataframe
- Ans.
RDD is a low-level distributed data structure while DataFrame is a high-level structured data abstraction.
RDD is immutable and unstructured while DataFrame is structured and has a schema
DataFrames are optimized for SQL queries and can be cached in memory
RDDs are more flexible and can be used for complex data processing tasks
DataFrames are easier to use and provide a more concise syntax for data manipulation
RDDs are the...
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Skills evaluated in this interview
Selected
I applied via LinkedIn and was interviewed before Oct 2022. There were 4 interview rounds.
Basic dsa question in python and data engineering questions ,sql
Basic dsa question in python and data engineering questions
(1 Question)
- Q1. Salary negotiation
Selected
I applied via LinkedIn and was interviewed in Jul 2024. There was 1 interview round.
(2 Questions)
- Q1. SQL Window Functions and RANK, DENSE RANK Difference
- Ans.
SQL Window Functions like RANK and DENSE RANK are used to assign a rank to rows within a partition.
RANK function assigns a unique rank to each distinct row within a partition.
DENSE RANK function assigns a unique rank to each distinct row within a partition, but without any gaps.
Both functions are used with the OVER() clause in SQL to define the partition and order of rows.
- Q2. Hadoop Default Replication Factor
Interview Preparation Tips
- SQL
- Spark
- Hadoop
- YARN
Salary offered is below industry standard.
Overall not a good experience.
Skills evaluated in this interview
Shaival Acharya
I applied via LinkedIn and was interviewed before Sep 2019. There was 1 interview round.
Interview Questionnaire
1 Question
- Q1. What you would do if you have someone in your team who is unable to communicate ?
Interview Preparation Tips
Front end Developer Interview Questions & Answers
Coalition Technologies
Anonymous
posted on 15 Feb 2024
I applied via AmbitionBox and was interviewed in Jan 2024. There were 3 interview rounds.
It is the starting round in every companys
(1 Question)
- Q1. Ask me anything
(1 Question)
- Q1. Ask me anything
Interview Preparation Tips
- HTML
- CSS
- Javascript
- Servlets
- JDBC
- MySQL
Front end Developer Interview Questions & Answers
Coalition Technologies
Anonymous
posted on 9 Mar 2023
Selected
I applied via Company Website and was interviewed in Feb 2023. There were 4 interview rounds.
Nimber series arithmetic aptitude
(4 Questions)
- Q1. Why you lokking for a new role
- Q2. Ask me about webtechnologies
- Q3. Tell me about yousrself
- Q4. Ask me about my course
Calculator assignment on webtechnologies
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based on 1 interview
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Front end Developer
15
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Senior Associate
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