MySQL 按列名选择
示例
CREATE TABLE stack(
id INT,
username VARCHAR(30) NOT NULL,
password VARCHAR(30) NOT NULL
);
INSERT INTO stack (`id`, `username`, `password`) VALUES (1, 'Foo', 'hiddenGem');
INSERT INTO stack (`id`, `username`, `password`) VALUES (2, 'Baa', 'verySecret');询问
SELECT id FROM stack;
结果
+------+ | id | +------+ | 1 | | 2 | +------+