Podcast
Questions and Answers
A common programming term associated with the various methods in summarizing data is __________________.
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.
The DISTINCT keyword is used to remove __________________ rows from a query output.
duplicate
The SUM keyword will add values of a specified __________________.
The SUM keyword will add values of a specified __________________.
column
The AVG keyword will find the __________________ of all given values in a specified column.
The AVG keyword will find the __________________ of all given values in a specified column.
The MIN keyword finds and returns the __________________ value in a column.
The MIN keyword finds and returns the __________________ value in a column.
The MAX keyword finds and returns the __________________ value in a column.
The MAX keyword finds and returns the __________________ value in a column.
The COUNT keyword will count and return the number of __________________ in a column.
The COUNT keyword will count and return the number of __________________ in a column.
Transforming data into something relevant is known as transforming data into __________________ information.
Transforming data into something relevant is known as transforming data into __________________ information.
Eliminating duplicates is considered the most basic way of summarizing __________________.
Eliminating duplicates is considered the most basic way of summarizing __________________.
What is the primary purpose of aggregating data?
What is the primary purpose of aggregating data?
What is the main benefit of using the DISTINCT keyword in a query?
What is the main benefit of using the DISTINCT keyword in a query?
Which aggregate function finds the highest value in a column?
Which aggregate function finds the highest value in a column?
What is the purpose of the COUNT keyword in SQL?
What is the purpose of the COUNT keyword in SQL?
What is the result of aggregating data?
What is the result of aggregating data?
Which of the following is NOT a type of aggregate function?
Which of the following is NOT a type of aggregate function?
What is the benefit of using aggregation in SQL?
What is the benefit of using aggregation in SQL?
What is the purpose of the MIN keyword in SQL?
What is the purpose of the MIN keyword in SQL?
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.
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Description
Learn about summarizing data in SQL, including aggregation methods and eliminating duplicates.
