use students select xhID, 学号, 姓名,性别 from students.dbo.学生信息表 order by xhid ; select count( xhID) as num from students.dbo.学生信息表 where 性别 is null ![]() |
use students select xhID, 学号, 姓名,性别 from students.dbo.学生信息表 order by xhid ; select count( xhID) as num from students.dbo.学生信息表 where 性别 is null ![]() |
SQL Server 的语法: SELECT TOP number|percent column_name(s)FROM table_name 等...
一、问答题 1、数据库包含哪些哪几种后缀名的文件必须,这些...