SQL Basic Data Operations

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Questions and Answers

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.

<p>average</p> Signup and view all the answers

The MIN keyword finds and returns the __________________ value in a column.

<p>lowest</p> Signup and view all the answers

The MAX keyword finds and returns the __________________ value in a column.

<p>highest</p> Signup and view all the answers

The COUNT keyword will count and return the number of __________________ in a column.

<p>records</p> Signup and view all the answers

Transforming data into something relevant is known as transforming data into __________________ information.

<p>real</p> Signup and view all the answers

Eliminating duplicates is considered the most basic way of summarizing __________________.

<p>data</p> Signup and view all the answers

What is the primary purpose of aggregating data?

<p>To transform data into relevant information (A)</p> Signup and view all the answers

What is the main benefit of using the DISTINCT keyword in a query?

<p>To remove duplicate rows from a query output (D)</p> Signup and view all the answers

Which aggregate function finds the highest value in a column?

<p>MAX (C)</p> Signup and view all the answers

What is the purpose of the COUNT keyword in SQL?

<p>To count and return the number of records in a column (C)</p> Signup and view all the answers

What is the result of aggregating data?

<p>Summarized data (A)</p> Signup and view all the answers

Which of the following is NOT a type of aggregate function?

<p>SORT (D)</p> Signup and view all the answers

What is the benefit of using aggregation in SQL?

<p>To make data more concise and meaningful (A)</p> Signup and view all the answers

What is the purpose of the MIN keyword in SQL?

<p>To find the lowest value in a column (C)</p> Signup and view all the answers

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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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