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MySQL Tutorial - Using Group Functions in the SELECT Clause

By: FYIcenter.com

(Continued from previous topic...)

How To Use Group Functions in the SELECT Clause?

If group functions are used in the SELECT clause, they will be used on the rows that meet the query selection criteria, the output of group functions will be returned as output of the query. The following select statement returns 3 values calculate by 3 group functions on all rows of the "fyi_links" table:

mysql> SELECT COUNT(*), MAX(counts), MIN(created) 
   FROM fyi_links;
+----------+-------------+---------------------+
| COUNT(*) | MAX(counts) | MIN(created)        |
+----------+-------------+---------------------+
|        7 |           8 | 2003-01-01 00:00:00 |
+----------+-------------+---------------------+
1 row in set (0.37 sec)

(Continued on next topic...)

  1. What Is a SELECT Query Statement?
  2. How To Create a Testing Table with Test Data?
  3. How To Select All Columns of All Rows from a Table?
  4. How To Select Some Columns from a Table?
  5. How To Select Some Rows from a Table?
  6. How To Add More Data to the Testing Table?
  7. How To Sort the Query Output?
  8. Can the Query Output Be Sorted by Multiple Columns?
  9. How To Sort Output in Descending Order?
  10. How To Use SELECT Statement to Count Number of Rows?
  11. Can SELECT Statements Be Used on Views?
  12. How To Filter Out Duplications in Returning Rows?
  13. What Are Group Functions?
  14. How To Use Group Functions in the SELECT Clause?
  15. Can Group Functions Be Mixed with Non-group Selection Fields?
  16. How To Divide Query Output into Groups?
  17. How To Apply Filtering Criteria at Group Level?
  18. How To Count Duplicated Values in a Column?
  19. Can Multiple Columns Be Used in GROUP BY?
  20. Can Group Functions Be Used in the ORDER BY Clause?

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