1. Load the tidyverse package first and then explore the diamonds dataset. What’s the average price of premium cut diamonds in the diamonds dataset?
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
1. Load the tidyverse package first and then explore the diamonds dataset. What’s the average price of premium cut diamonds in the diamonds dataset?
2. Which is true about mutate() and transmute()? Select all the correct answers. Group of answer choices:
A. They both create new columns that are based upon existing columns.
B. mutate(flights, gain = dep_delay - arr_delay, speed = distance / air_time * 60)
and
transmute(flights, gain = dep_delay - arr_delay, hours = air_time / 60, gain_per_hour = gain / hours)
returns the same output.
C. If you only want to keep the new variables that you have created, use transmute() instead of mutate().
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