mysql查询语句有以下:select,加上一些函数、关键字,可以百度一下sql语句常用语句,自己上级操作一下
查询语句用＂select＂,最简单的就是直接用以下语句:sql:select * from tablename;从表“tablename”中查询出所有的数据.扩展:后面还可以增加“where”条件进行筛选.sql:select * from tablename where id 评论0 0 0
6、SELECT * FROM emp WHERE DEPTNO = 10 AND JOB = 'MANAGER' UNION SELECT * FROM emp WHERE DEPTNO = 20 AND JOB = 'CLERK' UNION SELECT * FROM emp WHERE JOB 'MANAGER' OR JOB 'CLERK' AND SAL >=
1 select* fromtablewherecourse_id = 'CS-101'groupbyid havingid notin(selectid fromtablewherecourse_id != 'CS-190'groupbyid)
create table #temp( rowid int identity, UserName varchar(50)) insert into #temp select top 15 UserNamefrom UserInfo select t.rowid,u.* from #temp t inner join UserInfo u on t.UserName=u.UserName 我用我们经常测试用的UserInfo 表举例 你可以建个,加点简单的字段测试
为点分真不容易1 select * from StuInfo2 select 考号,姓名,语文,数学,英语 from StuMarks3 select s1.考号,s1.姓名,s1.性别,s2.计算机基础,s2.SQL数据库 from StuInfo s1 left join StuMarks s2 on s1.学号=s2.学号 where 专业名!='计算
select * from t_usert_user 是表名
一使用SELECT子句进行多表查询 SELECT 字段名 FROM 表1,表2 … WHERE 表1.字段 = 表2.字段 AND 其它查询条件 SELECT a.id,a.name,a.address,a.date,b.math,b.english,b.chinese FROM tb_demo065_tel AS b,tb_demo065 AS a WHERE
在控制台输入select * from table where 条件=value;
select * from userinfo where article_name in (select top 3 article_name from userinfo where mc_time = '2009/09/03' group by article_name order by count(*) desc );如果只要article_nameselect top 3 article_name from userinfo where mc_time = '2009/09/03' group by article_name order by count(*) desc;