Which of the following gives you the total number of values in a column?
A. Count
B. Distinct
C. Average
By establishing a _______ you can establish a connection between an existing query and a new query. Any modifications made to the original query will automatically propagate to the other queries, ensuring consistency and up-to-date information.
A. duplicate query
B. dataflow
C. query reference
True or False: Reference queries can contribute to slow data refreshes due to their nature of referencing. When a reference query is refreshed, it needs to ensure that all the referenced queries are also refreshed to maintain data consistency.
A. True
B. False
Answer (2)
Count gives the total number of values in a column, query reference allows connections between queries to maintain consistency, and true signifies that reference queries may slow down data refreshes.
;
Let's address each question one by one.
Which of the following gives you the total number of values in a column?
The correct choice is (A) Count .
The COUNT function is used in various database systems and data analysis tools to determine the total number of values in a dataset or column. It counts all the entries, including duplicates and null values, which helps in understanding how many records or items are present in that specific column.
By establishing a _______ you can establish a connection between an existing query and a new query. Any modifications made to the original query will automatically propagate to the other queries, ensuring consistency and up-to-date information.
The correct choice is (C) query reference .
A query reference in data management and processing allows you to create a new query that is directly connected to an existing one. This means any updates or changes made to the original query will be reflected in the query reference automatically, helping maintain data accuracy and consistency across different analyses. This feature is commonly used in data transformation and visualization tools like Power BI.
True or False: Reference queries can contribute to slow data refreshes due to their nature of referencing. When a reference query is refreshed, it needs to ensure that all the referenced queries are also refreshed to maintain data consistency.
The correct answer is (A) True .
Reference queries involve dependency relationships with other queries, meaning that when a reference query is being refreshed, it ensures that any queries it relies on are also updated. This dependency chain can lead to slower refresh times, particularly if there are multiple layers of reference or if the data involved is substantial. Ensuring consistent and up-to-date information requires this exhaustive refresh process.
