Something

CREATE TABLE  Item (
       itemId INT NOT NULL AUTO_INCREMENT
     , pageId INT NOT NULL
     , containerId INT NOT NULL
     , contentTypeId INT NOT NULL
     , createdDate DATETIME NOT NULL
     , modifiedDate TIMESTAMP
     , UNIQUE UQ_Item_1 (pageId, containerId)
     , PRIMARY KEY (itemId)
     , INDEX (pageId)
     , CONSTRAINT FK_Item_1 FOREIGN KEY (pageId)
                  REFERENCES  Page (pageId)
)TYPE=InnoDB;