sql列轉行
阿新 • • 發佈:2020-11-04
建表語句:
SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for studentscores -- ---------------------------- DROP TABLE IF EXISTS `studentscores`; CREATE TABLE `studentscores` ( `UserName` varchar(20) CHARACTER SET utf8 DEFAULT NULL, `Subject` varchar(30) CHARACTER SET utf8 DEFAULT NULL, `Score` float DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1; -- ---------------------------- -- Records of studentscores -- ---------------------------- INSERT INTO `studentscores` VALUES ('Nick', '語文', '80'); INSERT INTO `studentscores` VALUES ('Nick', '數學', '90'); INSERT INTO `studentscores` VALUES ('Nick', '英語', '70'); INSERT INTO `studentscores` VALUES ('Nick', '生物', '85'); INSERT INTO `studentscores` VALUES ('Kent', '語文', '80'); INSERT INTO `studentscores` VALUES ('Kent', '數學', '90'); INSERT INTO `studentscores` VALUES ('Kent', '英語', '70'); INSERT INTO `studentscores` VALUES ('Kent', '生物', '85');
表資料:
列轉行:
select username, max(case subject when '語文' then score else 0 end) as '語文', max(case subject when '數學' then score else 0 end) as '數學', max(case subject when '英語' then score else 0 end) as '英語', max(case subject when '生物' then score else 0 end) as '生物' from studentscores group by username
結果: