CREATE TABLE `sampdb`.`tbl_activities` (
  `ac_id` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
  `ac_addupdate` TIMESTAMP NOT NULL,
  `ac_place` VARCHAR( 20 ) NOT NULL,
  `ac_product` VARCHAR( 25 ) NOT NULL,
  `ac_datefrom` DATETIME NOT NULL,
  `ac_dateto` DATETIME NOT NULL,
  PRIMARY KEY(`ac_id`)
)
ENGINE = InnoDB;

Primerna takoi.
ad_place | ac_product |  2005 - 01  |  2005 - 02  |  2005 - 03  |  2005 - 04  | ...
-------------------------------------------------------------------
 1 .fl.    | prod1      |  2  -  31   |  1  -  28   | Full    |  1  -  29   |  1  - ...
 1 .fl.    | prod5      | Full    |  1  -  15   |  30  -  31  |  1  -  20   |  1  - ...
 5 .fl     | prod1      |  1 - 15     | Full    |  3  -  20   |  1  -  15  /  20  -  29  | ...