sql 行列式 轉換,

參考:http://www.cnblogs.com/lhj588/p/3315876.html

SELECT Date ,
MAX(CASE NAME WHEN '小說' THEN Scount ELSE 0 END ) 小說,
MAX(CASE NAME WHEN '文章' THEN Scount ELSE 0 END ) 文章,
MAX(CASE NAME WHEN '微信' THEN Scount ELSE 0 END ) 微信 
FROM TabName  
GROUP BY Date;

CREATE TABLE `tabname` (
  `Id` int(11) NOT NULL AUTO_INCREMENT,
  `Name` varchar(20) DEFAULT NULL,
  `Date` date DEFAULT NULL,
  `Scount` int(11) DEFAULT NULL,
  PRIMARY KEY (`Id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;
INSERT INTO `yaoshi`.`tabname` (`Id`, `Name`, `Date`, `Scount`) VALUES ('1', '小說', '2013-09-01', '10000');
INSERT INTO `yaoshi`.`tabname` (`Id`, `Name`, `Date`, `Scount`) VALUES ('2', '微信', '2013-09-01', '20000');
INSERT INTO `yaoshi`.`tabname` (`Id`, `Name`, `Date`, `Scount`) VALUES ('3', '小說', '2013-09-02', '30000');
INSERT INTO `yaoshi`.`tabname` (`Id`, `Name`, `Date`, `Scount`) VALUES ('4', '微信', '2013-09-02', '35000');
INSERT INTO `yaoshi`.`tabname` (`Id`, `Name`, `Date`, `Scount`) VALUES ('5', '小說', '2013-09-03', '31000');
INSERT INTO `yaoshi`.`tabname` (`Id`, `Name`, `Date`, `Scount`) VALUES ('6', '微信', '2013-09-03', '36000');
INSERT INTO `yaoshi`.`tabname` (`Id`, `Name`, `Date`, `Scount`) VALUES ('7', '小說', '2013-09-04', '35000');
INSERT INTO `yaoshi`.`tabname` (`Id`, `Name`, `Date`, `Scount`) VALUES ('8', '微信', '2013-09-04', '38000');
INSERT INTO `yaoshi`.`tabname` (`Id`, `Name`, `Date`, `Scount`) VALUES ('9', '文章', '2013-09-04', '22');