What does SQL stand for?
AnswerStructured Query Language
SQL is the standard language for querying and managing tables in databases.
Tech · Facts & stats
Big Data facts & stats
7 fact-checked facts about big data, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What does CSV stand for?
AnswerComma-separated values
A CSV file stores a table as plain text, with commas between the values in each row.
Going deeper
Big data is often described by three Vs: volume, velocity and what?
AnswerVariety
The original three Vs describe how much data there is, how fast it arrives and how many forms it takes.
What is a 'data lake'?
AnswerA store that holds large amounts of raw data in its original format
Data lakes keep raw data of many types so it can be processed later for different purposes.
Which average is least affected by a few extreme outliers?
AnswerThe median
The median is the middle value, so a few huge or tiny values barely move it.
Expert level
In databases, what is 'sharding'?
AnswerSplitting a dataset across multiple servers
Sharding divides rows among many machines so each holds part of the data, letting systems scale out.
What does the term 'NoSQL' generally describe?
AnswerDatabases that do not rely on the traditional relational table model
NoSQL, often read as 'not only SQL', covers document, key-value, column and graph databases.
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