王思达all

摘要： 删除DataTableExample :DROP TABLE TablenName数据表取别名，在该 sql 语句中可以通过别名取字段Example ：SELECT u.email , p.productname FROM UserInfo u , ProductList p;BETWEEN :取范围内的数据SELECT username , dateline FROM UserInfo WHERE dateline BETWEEN Value1 and Value2;从结果中取值:SELECT username , dateline FROM UserInfo WHERE username. 阅读全文