SQL 必知必会笔记2检索和排序数据
1.检索数据 使用SELECT 检索表数据，必须至少给出两条信息想选择什么， 以及从什么地方选择。 检索不同的值 使用DISTINCT关键字，检索不同的值，使用示例： SELECT DISTINCT vend_id FROM Products;
1.检索数据
使用SELECT 检索表数据，必须至少给出两条信息——想选择什么， 以及从什么地方选择。
检索不同的值
使用DISTINCT关键字，网站空间，检索不同的值，美国空间，使用示例：
SELECT DISTINCT vend_id FROM Products; ，香港虚拟主机
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