摘要: 1、case语句 用于选择语句 SELECT ProductNumber, Category = CASE ProductLine WHEN 'R' THEN 'Road' WHEN 'M' THEN 'Mountain' WHEN 'T' THEN 'Touring' WHEN 'S' THEN 阅读全文
posted @ 2017-05-25 07:22 mopheify 阅读(627) 评论(0) 推荐(0) 编辑