I Data engineer sono professionisti informatici richiesti pressoché in tutti i settori. Si occupano di monitorare i trend dei dati per pianificare le azioni più adeguate che un'azienda deve intraprendere. Uno degli aspetti più critici del lavoro di un Data engineer è l'elaborazione dei dati grezzi e la loro trasformazione in dati utilizzabili per creare pipeline e sistemi di dati.
Write a function to parse a string make sure that it's a well formed JSON. Essentially matching the order of opening and closing enclosures (){}[]. Erroneous examples would have them out of order and opening without closing or closing without opening.
Correlated SQL queries, when would you use it and why? What executes first, inner or outer ?
2 python -> buy/sell I + needle/haystack 1 mysql -> nth highest salary without row_number/rank
There was a string parsing question via Python. Just know how to parse a string into words or even letters and to apply some sort of logic to the string.
given some sample web UI log data, write a python algorithm to answer various questions
Don't focus only on Leetcode SQL questions. Their questions are more higher level. Prepare for advanced ETL questions. You should write the best solution immediately instead of just writing the solution down.
Show gender, min birthday and max birthdate where a customer bought at least one product
Dot Product with Sparse Vectors, Dot product of sparse vectors stored as hashmaps
How would you design and build a data model to report on active users and number of posts by interface (ipad, iphone, desktop web, etc) given a hierarchy of these interfaces and their rollup groupings, at any and all levels of the hierarchy?
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