What is a correlated subquery?

Practice More Questions From: Retrieving Big Data Quiz

Q:

What does it mean for a query language to be declarative?

Q:

How would you go about querying the entire database table (please refer to question 2’s table)?

Q:

Use the following table named "user_table" to answer the next 2 problems. userId username email 1 admin admin@corporate.moe 2 h4xor 1337@rawr.cte

Q:

What is the global indexing table?

Q:

What are the three computing steps of a semi-join?

Q:

What is the purpose of a semi-join?

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What is a subquery?

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What is a correlated subquery?

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What is the purpose of GROUP BY queries?

Q:

Consider the following generic statement for questions 10-12: db.<collection>.find(<query filter>, <projection>).<cursor modifier>Which part of the statement would reflect that of the FROM statement in SQL as illustrated in the lecture?

Q:

Which part of the statement would reflect that of the SELECT statement in SQL as illustrated in the lecture?

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Which part of the statement would reflect that of the WHERE statement in SQL as illustrated in the lecture?

Q:

A sample part of the data structure is as follows: { _id:1, userIndex: 10, email: “arealeamil@notreallu.asd", retainRate:2}What would be the most likely statement that we would need to grab email info for user indexes greater than 24?

Q:

What does it mean to have a _id:0 within our query statement?

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