Questions and Answers
What do SQL aggregate functions do?
Perform a calculation on multiple values and return a single value
Which SQL join type returns all records when there is a match in either left or right table?
Full outer join
In SQL, which aggregate function calculates the average of a set of values?
AVG
Which SQL join type returns all records from the right table, and the matched records from the left table?
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What does an SQL aggregate function do with NULL values?
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Study Notes
SQL Aggregate Functions
- SQL aggregate functions perform calculations on a set of values, returning a single value as a result.
- These functions operate on a group of rows, producing a summary of the data.
SQL Join Types
- A FULL OUTER JOIN returns all records when there is a match in either the left or right table.
- A RIGHT JOIN returns all records from the right table, and the matched records from the left table.
SQL Aggregate Functions: Average
- The AVG() function calculates the average of a set of values.
SQL Aggregate Functions: NULL Values
- SQL aggregate functions ignore NULL values, excluding them from calculations.
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