SQL Server单表数据查询举例详解

SELECT * FROM student

SELECT sno,sname FROM student

SELECT sname,YEAR(GETDATE())-sageFROM student

SELECT sname 姓名,YEAR(GETDATE())-sage 出生年FROM student

select * FROM student WHERE sdept='CS'

select * FROM student WHERE sdept='CS' AND ssex='男'

select * from student where sage>=18 and sage<=20

select * from student where sage BETWEEN '18' AND '20'

select * from student where sage<18 or sage>20

select * from student where sage not BETWEEN '18' AND '20'

select * from student where sdept='CS' or sdept='JD'

select * from student where sdept in('CS','JD')

select * from student where sname like'张%'

select sno,sname from student WHERE sname LIKE '李_';

select * from sc WHERE grade IS NULL;

select DISTINCT sage FROM student WHERE sdept='cs'

select TOP 3 * from student

select COUNT(sno) 男生人数 from student where ssex='男'

select COUNT(*) AS 男生人数 from student where ssex='男'

select COUNT(distinct sno) from sc

select max(grade) 最高分,MIN(grade) 最低分 from sc

select SUM(grade) 总分,AVG(grade) 平均分 from sc where sno='1204304102'

select sname 姓名,YEAR(GETDATE())-sage as 出生年,院系=sdept from student

select * from student where sname like'张%'

select * from student where sname like'黄_'

select * from student where sname like'_文_'

select TOP 3 * from student

select grade from sc where cno='2102' order by grade desc

select TOP 2 grade from sc where cno='2102' order by grade desc