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489 interview questionsfor Blockchain Expert (2026)

Test your technical skills before an interview of Blockchain Expert with 489 corrected questions. Beginner, Intermediate or Expert level.

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489 questions
Easy
53 votes3632 runs0 comment

Write a SQL query to retrieve the list of employees with a salary greater than 5100.

Back-end developer
sql
select
where
Vincent Cotroat Mar 30, 2023
Easy
21 votes3596 runs0 comment

Write a SQL query to insert data into a table

Back-end developer
sql
insert
Vincent Cotroat Mar 27, 2023
Easy
21 votes3581 runs0 comment

Select only distinct values in a column using SQL

Back-end developer
sql
distinct
Vincent Cotroat Mar 27, 2023
Medium
21 votes1586 runs0 comment

How to handle missing data in a given training data set ?

Data Scientist
machine learning
missing data
Martinat Apr 4, 2022
Easy
19 votes3489 runs1 comment

Update a column in an SQL table

Back-end developer
sql
update
Vincent Cotroat Nov 7, 2023
Easy
18 votes923 runs0 comment

What is the missing word in the following sentence: Overfitting is the production of a model that corresponds too closely to the training data set and may therefore fail to fit other data sets and so fail to perform any reliable forecast.

Data Scientist
overfitting
Martinat Mar 14, 2022
Easy
17 votes3557 runs0 comment

Which SQL keyword is used to sort the result of a SELECT statement?

Back-end developer
sql
order by
Vincent Cotroat Mar 27, 2023
Easy
16 votes899 runs0 comment

What is the relation between Artificial intelligence (AI), machine learning and deep learning?

Data Scientist
machine learning
deep learning
Martinat Sep 19, 2022
Easy
16 votes535 runs0 comment

What does EVM stand for?

Blockchain Expert
ethereum
virtual machine
Anonymous authorat Nov 7, 2022
Medium
14 votes3525 runs4 comments

Write the SQL query to delete a column from a table

Back-end developer
sql
table
column
Vincent Cotroat Mar 27, 2023
Medium
12 votes1436 runs0 comment

How to handle missing data in a given training data set ?

Data Scientist
machine learning
missing data
Martinat Apr 4, 2022
Easy
12 votes1110 runs0 comment

What is the value of the decision threshold used with logistic regression in Scikit-learn?

Data Scientist
scikit-learn
threshold
logistic regression
Anonymous authorat Apr 6, 2022
Easy
12 votes1041 runs0 comment

How is the error calculated during back propagation in a neural network?

Data Scientist
neural network
back propagation
Anonymous authorat Apr 6, 2022
Easy
11 votes3494 runs0 comment

How to delete an SQL table?

Back-end developer
sql
tables
Vincent Cotroat Mar 27, 2023
Easy
11 votes3387 runs0 comment

Write a SQL query to retrieve the products with a price less than 1000 and sort the results in descending order of price.

Back-end developer
sql
order by
descending
Vincent Cotroat Mar 28, 2023
Medium
11 votes1539 runs0 comment

The validation set is used to provide frequent and unbiased evaluations of the model’s fit on the training set while tuning its hyperparameters/parameters: in other words,the model is found and then tested on the validation set before to be improved once again.

Data Scientist
hyperparameters
model
Martinat Mar 15, 2022
Easy
10 votes3475 runs0 comment

Count the number of rows in an SQL table

Back-end developer
sql
count
Vincent Cotroat Mar 27, 2023
Easy
10 votes3387 runs
2 comments

Write a SQL query to increase the salary of all employees by 10%.

Back-end developer
sql
update
salary
Vincent Cotroat Mar 28, 2023
Easy
10 votes616 runs0 comment

Which command in PostgreSQL is used to delete a database?

Data Scientist
abdelghaniat Apr 19, 2024
Easy
10 votes563 runs
1 comment

What is the main purpose of the LSTM (Long Short-Term Memory) model in machine learning?

Data Scientist
Artificial Intelligence
abdelghaniat Mar 26, 2024
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