练习_代码007

写出sql 语句，查询所有年龄大于20岁的员工
	2	select * from employee where age>20;
	3	写出sql 语句，查询所有年龄大于等于22小于25的女性员工
	4	select * from emp loye e where age b e tween 22 and 25 and sex=’女’;
	5	写出sql 语句，统计男女员工各有多少名
	6	select Se x,count(*) as count from emp loye e group by Sex;
	7	写出sql语句，按照年龄降序获取员工信息
	8	select * from em loyee where age index;
	9	写出sql语句，获取员工中哪个姓名具有重名现象
	10	s elec t Name,count(*) as count from emp loyee group by Name having count>1;
	11	写出sql语句，查询所有姓张的员工
	12	selec t * from employee where Name like ‘张%’;
	13	写出sql语句，查询住址为北京的前3条记录
	14	selec t * from employee where Ad d res s=’北京’ limit 3;
	15	写出sql语句，查询员工总数
	16	selec t count(*) from employee;
	17	写出sql语句，向表中插入一条记录
	18	insert into employee
	19	values(“周一”，“男”，“25”，“张家口”);
	20	写出sql语句，修改员工张四的住址为南京
	21	update employee set Ad d ress=’南京‘ where Name=’张四’;
	22	写出sql语句，删除年龄大于24岁的女员工
	23	delete from employee where Sex=’女’ and Age>24; java第二十四课. · 7719ec3 · WL—code/WL仓库 – Gitee.com