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Senior Data Engineer | SQL, MongoDB | Fill sparse table

Contains following tasks:

1) Choice questions - assessing knowledge of SQL, MongoDB, NoSQL

2) Code gaps - assessing knowledge of Mongo, MongoDB

3) Task [level: Hard] - SQL | Fill sparse table - Write a query that will return the list of all users with the creation date and return the date from the previous not-null row for the entries affected with the bug.

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Tasks details:

Code gaps

senior level
Skills: MongoDB Mongo

Mongo | Query | Update records meeting the criteria

SQL exercise

senior level
Skills: SQL

SQL | Fill sparse table

Code gaps

senior level
Skills: MongoDB Mongo

Mongo | Query | Return specified products

Choice questions

senior level
Skills: MongoDB NoSQL SQL

6 choice questions

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