摘要: GROUP BY 语法:SELECT column_name, function(column_name)FROM table_nameWHERE column_name operator valueGROUP BY column_name实例表结构如下:BookComments列 名类型长度是否允许为空说明CommentsNobigint8否主键 非负 自增BookNovarchar50否外键 ... 阅读全文
posted @ 2010-04-03 00:33 樱色布 阅读(670) 评论(2) 推荐(1) 编辑