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.
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The MIN keyword finds and returns the __________________ value in a column.
The MIN keyword finds and returns the __________________ value in a column.
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The MAX keyword finds and returns the __________________ value in a column.
The MAX keyword finds and returns the __________________ value in a column.
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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.
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Transforming data into something relevant is known as transforming data into __________________ information.
Transforming data into something relevant is known as transforming data into __________________ information.
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Eliminating duplicates is considered the most basic way of summarizing __________________.
Eliminating duplicates is considered the most basic way of summarizing __________________.
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What is the primary purpose of aggregating data?
What is the primary purpose of aggregating data?
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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?
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Which aggregate function finds the highest value in a column?
Which aggregate function finds the highest value in a column?
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What is the purpose of the COUNT keyword in SQL?
What is the purpose of the COUNT keyword in SQL?
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What is the result of aggregating data?
What is the result of aggregating data?
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Which of the following is NOT a type of aggregate function?
Which of the following is NOT a type of aggregate function?
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What is the benefit of using aggregation in SQL?
What is the benefit of using aggregation in SQL?
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What is the purpose of the MIN keyword in SQL?
What is the purpose of the MIN keyword in SQL?
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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.
