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Константин Литвинов
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29 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following statements is true regarding PostgreSQL VIEWs?
VIEWs can be used to simplify complex queries and provide a layer of abstraction.
VIEWs can only be created on a single table.
VIEWs can contain INSERT, UPDATE, and DELETE statements
VIEWs are always updatable by default
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What window function incorporates the count of rows with the same value into the rank of the tied rows, resulting in non-sequential ranks
RANK()
CUME_DIST()
ROW_NUMBER()
PERCENT_RANK()
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is an aggregate function?
LEFT()
COUNT()
LENGTH()
UPPER()
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is Atomicity in the context of ACID properties?
Ensuring that a transaction is treated as a single unit, which is either fully completed or fully rolled back
Ensuring that a transaction is divided into multiple smaller transactions
Ensuring that the transaction results are permanently stored in the database
Ensuring that the database can handle multiple transactions concurrently
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the CUBE keyword do in conjunction with GROUP BY?
It creates a grouping set that includes all possible combinations of columns
It filters the result set based on a specific condition.
It assumes a hierarchy among the input columns and generates all grouping sets that make sense considering the hierarchy
All of the above
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which clause is used to define a window for window functions?
WHERE
OVER
WINDOW
GROUP BY
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which window function is used to return the same rank for the rows which have the same values?
DENSE_RANK()
PERCENT_RANK()
NTILE()
CUME_DIST()
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