摘要:
Program using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Data.SqlClient;nam 阅读全文
摘要:
use Myschool --查询对应年级下的人数SELECT COUNT(1) AS '人数' FROM Student WHERE GradeId=1SELECT COUNT(1) AS '人数' FROM Student WHERE GradeId=2SELECT COUNT(1) AS '人 阅读全文