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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?
What is the purpose of a SINGLE-ROW FUNCTION in SQL?
What is the purpose of a SINGLE-ROW FUNCTION in SQL?
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?
What do CHARACTER FUNCTIONS do in SQL?
What do CHARACTER FUNCTIONS do in SQL?
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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?
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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?
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What does the TRUNCATE function do in SQL?
What does the TRUNCATE function do in SQL?
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What does the INSTR function do?
What does the INSTR function do?
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Which function is used to link strings together in SQL?
Which function is used to link strings together in SQL?
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What is the purpose of the ROUND function with decimal places specified?
What is the purpose of the ROUND function with decimal places specified?
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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?
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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.
