mysql 将列值转变为列的方法
摘要：复制代码代码如下:--创建库CREATETABLE`rate`(`uname`VARCHAR(300),`object`VARCHAR(30...
复制代码 代码如下:
-- 创建库
CREATE TABLE `rate` (
`uname` VARCHAR (300),
`object` VARCHAR (300),
`score` VARCHAR (300)
);
-- 插入数据
INSERT INTO test.rate (uname, object, score)
VALUES('aaa', 'chinese', '67'),
('aaa', 'math', '89'),
('aaa', 'physical', '89'),
('bbb', 'chinese', '67'),
('bbb', 'math', '75'),
('bbb', 'physical', '89');
-- 查询
SELECT DISTINCT uname AS '姓名',
SUM(CASE object
WHEN 'chinese' THEN score END) AS '语文',
SUM(CASE object
WHEN 'math' THEN score END) AS '数学',
SUM(CASE object
WHEN 'physical' THEN score END) AS '物理' FROM rate GROUP BY uname;
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