经典sql50题附答案适合初学者练手!

进来了, 点个赞再走吧, 谢谢您了. – 数据源 /* create database test50; use test50; create table Student(sid varchar(10),sname varchar(10),sage datetime,ssex nvarchar(10)); insert into Student values(‘01’ , ‘赵雷’ , ‘1990-01-01’ , ‘男’); insert into Student values(‘02’ , ‘钱电’ , ‘1990-12-21’ , ‘男’); insert into Student val