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MySQL Tutorial - Assign Names to Query Output Columns

By: FYIcenter.com

(Continued from previous topic...)

How To Name Query Output Columns?

Each column in the query output has a default name. If you don't like the default name, you can specify a new name for any column in the query output by using the AS clause. The following statement shows you a good example:

mysql> SELECT tag AS Category, YEAR(created) AS Year, 
   COUNT(*) AS Counts FROM fyi_links 
   GROUP BY tag, YEAR(created) ORDER BY COUNT(*) DESC;
+----------+------+--------+
| Category | Year | Counts |
+----------+------+--------+
| DBA      | 2006 |      2 |
| DEV      | 2006 |      1 |
| SQA      | 2006 |      1 |
| DBA      | 2005 |      1 |
| DEV      | 2004 |      1 |
| SQA      | 2003 |      1 |
+----------+------+--------+
6 rows in set (0.00 sec)

(Continued on next topic...)

  1. How To Join Two Tables in a Single Query?
  2. How To Write a Query with an Inner Join?
  3. How To Define and Use Table Alias Names?
  4. How To Write a Query with a Left Outer Join?
  5. How To Write a Query with a Right Outer Join?
  6. How To Write a Query with a Full Outer Join?
  7. How To Write an Inner Join with the WHERE Clause?
  8. How To Name Query Output Columns?
  9. What Is a Subquery?
  10. How To Use Subqueries with the IN Operator?
  11. How To Use Subqueries with the EXISTS Operator?
  12. How To Use Subqueries in the FROM clause?
  13. How To Count Groups Returned with the GROUP BY Clause?
  14. How To Return Top 5 Rows?
  15. How To Return the Second 5 Rows?
  16. How To Use UNION to Merge Outputs from Two Queries Together?

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