Update with limitation and calculation : Update « Insert Delete Update « SQL / MySQL

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SQL / MySQL » Insert Delete Update » Update 
Update with limitation and calculation

/*

mysql> select * from Orders;
+---------+--------+----------+---------------------+
| OrderID | BookID | Quantity | DateOrdered         |
+---------+--------+----------+---------------------+
|    1001 |    103 |        1 | 2004-01-12 12:30:00 |
|    1002 |    101 |        1 | 2001-02-12 12:31:00 |
|    1003 |    103 |        2 | 2002-03-12 12:34:00 |
|    1004 |    104 |        3 | 2003-04-12 12:36:00 |
|    1005 |    102 |        1 | 2004-05-12 12:41:00 |
|    1006 |    103 |        2 | 2001-06-12 12:59:00 |
|    1007 |    101 |        1 | 2002-07-12 13:01:00 |
|    1008 |    103 |        1 | 2003-08-12 13:02:00 |
|    1009 |    102 |        4 | 2004-09-12 13:22:00 |
|    1010 |    101 |        2 | 2005-11-12 13:30:00 |
|    1011 |    103 |        1 | 2006-12-12 13:32:00 |
|    1012 |    105 |        1 | 2001-02-12 13:40:00 |
|    1013 |    106 |        2 | 2002-04-12 13:44:00 |
|    1014 |    103 |        1 | 2003-06-12 14:01:00 |
|    1015 |    106 |        1 | 2005-01-12 14:05:00 |
|    1016 |    104 |        2 | 2003-11-12 14:28:00 |
|    1017 |    105 |        1 | 2002-03-12 14:31:00 |
|    1018 |    102 |        1 | 2001-05-12 14:32:00 |
|    1019 |    106 |        3 | 2003-07-12 14:49:00 |
|    1020 |    103 |        1 | 2004-01-12 14:51:00 |
+---------+--------+----------+---------------------+
20 rows in set (0.01 sec)

mysql> UPDATE Orders
    -> SET Quantity=Quantity+1
    -> WHERE BookID=103
    -> ORDER BY DateOrdered DESC
    -> LIMIT 5;
Query OK, 5 rows affected (0.03 sec)
Rows matched: 5  Changed: 5  Warnings: 0

mysql> select * from Orders;
+---------+--------+----------+---------------------+
| OrderID | BookID | Quantity | DateOrdered         |
+---------+--------+----------+---------------------+
|    1001 |    103 |        2 | 2005-10-09 08:51:26 |
|    1002 |    101 |        1 | 2001-02-12 12:31:00 |
|    1003 |    103 |        2 | 2002-03-12 12:34:00 |
|    1004 |    104 |        3 | 2003-04-12 12:36:00 |
|    1005 |    102 |        1 | 2004-05-12 12:41:00 |
|    1006 |    103 |        2 | 2001-06-12 12:59:00 |
|    1007 |    101 |        1 | 2002-07-12 13:01:00 |
|    1008 |    103 |        2 | 2005-10-09 08:51:26 |
|    1009 |    102 |        4 | 2004-09-12 13:22:00 |
|    1010 |    101 |        2 | 2005-11-12 13:30:00 |
|    1011 |    103 |        2 | 2005-10-09 08:51:26 |
|    1012 |    105 |        1 | 2001-02-12 13:40:00 |
|    1013 |    106 |        2 | 2002-04-12 13:44:00 |
|    1014 |    103 |        2 | 2005-10-09 08:51:26 |
|    1015 |    106 |        1 | 2005-01-12 14:05:00 |
|    1016 |    104 |        2 | 2003-11-12 14:28:00 |
|    1017 |    105 |        1 | 2002-03-12 14:31:00 |
|    1018 |    102 |        1 | 2001-05-12 14:32:00 |
|    1019 |    106 |        3 | 2003-07-12 14:49:00 |
|    1020 |    103 |        2 | 2005-10-09 08:51:26 |
+---------+--------+----------+---------------------+
20 rows in set (0.00 sec)


*/

Drop table Orders;

CREATE TABLE Orders
(
   OrderID SMALLINT NOT NULL PRIMARY KEY,
   BookID SMALLINT NOT NULL,
   Quantity TINYINT (40NOT NULL DEFAULT 1,
   DateOrdered TIMESTAMP,
   FOREIGN KEY (BookIDREFERENCES Books (BookID)
)
ENGINE=INNODB;


INSERT INTO Orders VALUES (10011031'2004-01-12 12:30:00'),
                          (10021011'2001-02-12 12:31:00'),
                          (10031032'2002-03-12 12:34:00'),
                          (10041043'2003-04-12 12:36:00'),
                          (10051021'2004-05-12 12:41:00'),
                          (10061032'2001-06-12 12:59:00'),
                          (10071011'2002-07-12 13:01:00'),
                          (10081031'2003-08-12 13:02:00'),
                          (10091024'2004-09-12 13:22:00'),
                          (10101012'2005-11-12 13:30:00'),
                          (10111031'2006-12-12 13:32:00'),
                          (10121051'2001-02-12 13:40:00'),
                          (10131062'2002-04-12 13:44:00'),
                          (10141031'2003-06-12 14:01:00'),
                          (10151061'2005-01-12 14:05:00'),
                          (10161042'2003-11-12 14:28:00'),
                          (10171051'2002-03-12 14:31:00'),
                          (10181021'2001-05-12 14:32:00'),
                          (10191063'2003-07-12 14:49:00'),
                          (10201031'2004-01-12 14:51:00');

select from Orders;

UPDATE Orders
SET Quantity=Quantity+1
WHERE BookID=103
ORDER BY DateOrdered DESC
LIMIT 5;

select from Orders;


           
       
Related examples in the same category
1. Do PLUS calculation in where clause
2. Assign value in select clause
3. Modifying Row Data
4. Update records with calculation based on two tables
5. Update two tables with calculation
6. Using UPDATE Statements to Modify Data in Joined Tables
7. Update with condition
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