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MySQL Tutorial - Using Column Default Values

By: FYIcenter.com

(Continued from previous topic...)

How To Specify Default Values in INSERT Statement?

If a column is defined with a default value in a table, you can use the key word DEFAULT in the INSERT statement to take the default value for that column. The following tutorial exercise gives a good example:

mysql> INSERT INTO fyi_links VALUES (102, 
  'dba.fyicenter.com', 
  NULL,
  0,
  DEFAULT);
Query OK, 1 row affected, 1 warning (0.01 sec)

mysql> SELECT id, url, notes, counts, DATE(created) 
   FROM fyi_links;
+-----+-------------------+-------+--------+---------------+
| id  | url               | notes | counts | DATE(created) |
+-----+-------------------+-------+--------+---------------+
| 101 | dev.fyicenter.com | NULL  |      0 | 2006-04-30    |
| 102 | dba.fyicenter.com | NULL  |      0 | 2006-07-01    |
+-----+-------------------+-------+--------+---------------+
2 rows in set (0.00 sec)

(Continued on next topic...)

1. What Are DML Statements?
2. How To Create a Testing Table?
3. How To Insert a New Row into a Table?
4. How To Specify Default Values in INSERT Statement?
5. How To Omit Columns with Default Values in INSERT Statement?
6. What Happens If Unique Value Constraints Are Violated?
7. How To Insert Multiple Rows with One INSERT Statement?
8. How To Update Values in a Table?
9. How To Update Column Values on Multiple Rows?
10. How To Use Existing Column Values in the SET Clause?
11. Is the Order of Columns in the SET Clause Important?
12. How To Use Values from Other Tables in UPDATE Statements?
13. What Happens If the UPDATE Subquery Returns No Rows?
14. What Happens If the UPDATE Subquery Returns Multiple Rows?
15. How To Delete an Existing Row from a Table?
16. How To Delete Multiple Rows from a Table?
17. How To Delete All Rows in a Table?