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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?
What is the purpose of a SINGLE-ROW FUNCTION in SQL?
Which type of function is also known as a group or aggregate function?
What do CHARACTER FUNCTIONS do in SQL?
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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?
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What does the TRUNCATE function do in SQL?
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What does the INSTR function do?
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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?
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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.
