Using Single-Row Functions in Oracle Database
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Questions and Answers

Which type of function is used to display a single result row for every row of a queried table or view?

  • Single-row function (correct)
  • Aggregate function
  • Group function
  • Multiple-row function

What is the purpose of a SINGLE-ROW FUNCTION in SQL?

  • Perform calculations on multiple rows
  • Combine multiple rows into a single result row
  • Display a result row based on groups of rows
  • Display a single result row for each queried row (correct)

Which type of function is also known as a group or aggregate function?

  • Multiple-row function (correct)
  • Numeric function
  • Character function
  • Single-row function

What do CHARACTER FUNCTIONS do in SQL?

<p>Take characters as parameters and return character values (C)</p> Signup and view all the answers

When using a MULTIPLE-ROW FUNCTION in SQL, what does it typically display?

<p>A single result row based on groups of rows (D)</p> Signup and view all the answers

Which function would you use to change all characters in a data field to lowercase?

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

What does the TRUNCATE function do in SQL?

<p>Rounds up a number and shortens it based on decimal places (C)</p> Signup and view all the answers

What does the INSTR function do?

<p>Returns the location of a substring in a string (D)</p> Signup and view all the answers

Which function is used to link strings together in SQL?

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

What is the purpose of the ROUND function with decimal places specified?

<p>Rounds up a number to a specified decimal place (C)</p> Signup and view all the answers

If you want to get the remainder of dividing two numbers, which function would you use?

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

Flashcards

Single-Row Function

Displays one result row per queried table row.

Purpose of SINGLE-ROW FUNCTION

To show one result for each row.

Multiple-Row Function

Also known as group or aggregate functions.

CHARACTER FUNCTIONS

Accept characters and return character values.

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MULTIPLE-ROW FUNCTION display

Displays one result row for a group of rows.

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LOWER Function

Changes text to lowercase.

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TRUNCATE function

Shortens a number by decimal places.

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INSTR Function

Finds a substring's position in a string.

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CONCAT Function

Links two or more strings together.

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ROUND Function purpose

Rounds a number to decimal place.

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MOD Function

Returns the remainder of a division.

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Study Notes

Functions in Oracle Database

  • A function is a stored program that takes parameters and returns a value.

Single-Row Functions

  • Used to display a single result row for every row of a queried table or view.
  • Examples of single-row functions include:
    • Character functions (e.g. LOWER, LENGTH, INSTR, CONCAT, SUBSTR, TRIM)
    • Numeric functions (e.g. ROUND, TRUNCATE, MOD)

Multiple-Row Functions (Aggregate Functions)

  • Displays a single result row based on groups of rows.
  • Examples of multiple-row functions are not specified in the text.

Character Functions

  • Take one or more characters as parameters and return a character value.
  • Examples of character functions include:
    • LOWER: converts all characters to lowercase.
    • LENGTH: counts the number of characters in a string.
    • INSTR: returns the location of a substring in a string.
    • CONCAT: links together two or more strings.
    • SUBSTR: extracts a specified length of characters from a string.
    • TRIM: removes specified characters from the beginning or end of a string.

Numeric Functions

  • Accept any numeric input and return a numeric value.
  • Examples of numeric functions include:
    • ROUND: rounds a number to a specified number of decimal places.
    • TRUNCATE: truncates a number to a specified number of decimal places.
    • MOD: returns the remainder of a division operation.

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Description

Test your knowledge on using single-row functions in Oracle Database. Learn about the concepts of functions, differentiate between single row and multiple row functions, and identify common string and numeric functions in SQL.

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