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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?
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?
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?
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?
What do CHARACTER FUNCTIONS do in SQL?
When using a MULTIPLE-ROW FUNCTION in SQL, what does it typically display?
When using a MULTIPLE-ROW FUNCTION in SQL, what does it typically display?
Which function would you use to change all characters in a data field to lowercase?
Which function would you use to change all characters in a data field to lowercase?
What does the TRUNCATE function do in SQL?
What does the TRUNCATE function do in SQL?
What does the INSTR function do?
What does the INSTR function do?
Which function is used to link strings together in SQL?
Which function is used to link strings together in SQL?
What is the purpose of the ROUND function with decimal places specified?
What is the purpose of the ROUND function with decimal places specified?
If you want to get the remainder of dividing two numbers, which function would you use?
If you want to get the remainder of dividing two numbers, which function would you use?
Flashcards
Single-Row Function
Single-Row Function
Displays one result row per queried table row.
Purpose of SINGLE-ROW FUNCTION
Purpose of SINGLE-ROW FUNCTION
To show one result for each row.
Multiple-Row Function
Multiple-Row Function
Also known as group or aggregate functions.
CHARACTER FUNCTIONS
CHARACTER FUNCTIONS
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MULTIPLE-ROW FUNCTION display
MULTIPLE-ROW FUNCTION display
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LOWER Function
LOWER Function
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TRUNCATE function
TRUNCATE function
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INSTR Function
INSTR Function
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CONCAT Function
CONCAT Function
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ROUND Function purpose
ROUND Function purpose
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MOD Function
MOD Function
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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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