17 Questions
A common programming term associated with the various methods in summarizing data is __________________.
aggregation
The DISTINCT keyword is used to remove __________________ rows from a query output.
duplicate
The SUM keyword will add values of a specified __________________.
column
The AVG keyword will find the __________________ of all given values in a specified column.
average
The MIN keyword finds and returns the __________________ value in a column.
lowest
The MAX keyword finds and returns the __________________ value in a column.
highest
The COUNT keyword will count and return the number of __________________ in a column.
records
Transforming data into something relevant is known as transforming data into __________________ information.
real
Eliminating duplicates is considered the most basic way of summarizing __________________.
data
What is the primary purpose of aggregating data?
To transform data into relevant information
What is the main benefit of using the DISTINCT keyword in a query?
To remove duplicate rows from a query output
Which aggregate function finds the highest value in a column?
MAX
What is the purpose of the COUNT keyword in SQL?
To count and return the number of records in a column
What is the result of aggregating data?
Summarized data
Which of the following is NOT a type of aggregate function?
SORT
What is the benefit of using aggregation in SQL?
To make data more concise and meaningful
What is the purpose of the MIN keyword in SQL?
To find the lowest value in a column
Study Notes
Summarizing Data in SQL
- Aggregation is a common programming term associated with various methods of summarizing data, which means combining data into groups to transform it into "real" information.
- Aggregation allows data to be manipulated into something that is not merely displayed, but provides patterns or context.
Eliminating Duplicates
- Eliminating duplicates is considered the most basic way of summarizing data.
- It is done to prevent redundancy of data entries in query tables/results.
- The DISTINCT keyword is used to remove duplicate rows from a query output, and is placed immediately after the SELECT keyword.
Aggregate Functions
Aggregate Function Keywords
- SUM: adds values of a specified column.
- AVG: finds the average of all given values in a specified column.
- MIN: finds and returns the lowest value in a column.
- MAX: finds and returns the highest value in a column.
- COUNT: counts and returns the number of records in a column.
Summarizing Data in SQL
- Aggregation is a common programming term associated with various methods of summarizing data, which means combining data into groups to transform it into "real" information.
- Aggregation allows data to be manipulated into something that is not merely displayed, but provides patterns or context.
Eliminating Duplicates
- Eliminating duplicates is considered the most basic way of summarizing data.
- It is done to prevent redundancy of data entries in query tables/results.
- The DISTINCT keyword is used to remove duplicate rows from a query output, and is placed immediately after the SELECT keyword.
Aggregate Functions
Aggregate Function Keywords
- SUM: adds values of a specified column.
- AVG: finds the average of all given values in a specified column.
- MIN: finds and returns the lowest value in a column.
- MAX: finds and returns the highest value in a column.
- COUNT: counts and returns the number of records in a column.
Learn about summarizing data in SQL, including aggregation methods and eliminating duplicates.
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