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MySQL Tutorial - What Are Group Functions
(Continued from previous topic...)
What Are Group Functions?
Group functions are functions applied to a group of rows.
Examples of group functions are:
- COUNT(*) - Returns the number of rows in the group.
- MIN(exp) - Returns the minimum value of the expression evaluated on each row of the group.
- MAX(exp) - Returns the maximum value of the expression evaluated on each row of the group.
- AVG(exp) - Returns the average value of the expression evaluated on each row of the group.
(Continued on next topic...)
- What Is a SELECT Query Statement?
- How To Create a Testing Table with Test Data?
- How To Select All Columns of All Rows from a Table?
- How To Select Some Columns from a Table?
- How To Select Some Rows from a Table?
- How To Add More Data to the Testing Table?
- How To Sort the Query Output?
- Can the Query Output Be Sorted by Multiple Columns?
- How To Sort Output in Descending Order?
- How To Use SELECT Statement to Count Number of Rows?
- Can SELECT Statements Be Used on Views?
- How To Filter Out Duplications in Returning Rows?
- What Are Group Functions?
- How To Use Group Functions in the SELECT Clause?
- Can Group Functions Be Mixed with Non-group Selection Fields?
- How To Divide Query Output into Groups?
- How To Apply Filtering Criteria at Group Level?
- How To Count Duplicated Values in a Column?
- Can Multiple Columns Be Used in GROUP BY?
- Can Group Functions Be Used in the ORDER BY Clause?