1 題目描述

2 建表和插入數據

CREATE TABLE sales(id INT AUTO_INCREMENT PRIMARY KEY,YEAR VARCHAR(10),MONTH VARCHAR(10),amount FLOAT(2,1) );INSERT INTO sales VALUES (NULL,'1991','1',1.1), (NULL,'1991','2',1.2), (NULL,'1991','3',1.3), (NULL,'1991','4',1.4), (NULL,'1992','1',2.1), (NULL,'1992','2',2.2), (NULL,'1992','3',2.3), (NULL,'1992','4',2.4);
3 select語句

SELECT s.year , (SELECT t.amount FROM sales AS t WHERE t.month = '1' AND s.year = t.year) AS m1, (SELECT t.amount FROM sales AS t WHERE t.month = '2' AND s.year = t.year) AS m2, (SELECT t.amount FROM sales AS t WHERE t.month = '3' AND s.year = t.year) AS m3, (SELECT t.amount FROM sales AS t WHERE t.month = '4' AND s.year = t.year) AS m4 FROM sales AS s GROUP BY s.year

總結

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