www.3112.net > SQL查询中,"SELECT 学号,姓名,性别 FROM 学生 W...

SQL查询中,"SELECT 学号,姓名,性别 FROM 学生 W...

String s = "sf"; String sql = "select * from stu where stuName like '%"+s+"%'";

SELECT * FROM ABC W WHERE Creatdatetime=(SELECT min(Creatdatetime) FROM ABC WHERE ID=W.ID AND RESULT=W.RESULT)

1.select * from works where not exists(select 1 from data_1 where works.id=data_1.w_id) 2..select * from works where exists(select 1 from data_1 where works.id=data_1.w_id)

我不知道你所指具体是哪种分组,QQ还是手机联系人还是什么。 如果是说qq分组,方法如下: 1、在qq主界面右击,即可出现一串菜单,上面包括很多的分组操作,有显示企业分组、陌生人分组、添加分组、重命名分组、删除等。 2、准备添加好友分组,右...

--查询一: select w.id,w.name,w.format,w.type from works w where not exists ( select 1 from data_1 d where exists ( select 1 from user u where u.name='NO02' and u.id=d.u_id ) and w.id=d.w_id ); --查询二: seelct d.id,w.name,d.A,d...

是这个意思吗? SUM(CASE WHEN W.TypeID = 999 AND (SUM(CASE WHEN W.TypeID = 999 AND BDate='2014-04-02' THEN BValue ELSE 0 end) as EndingBalance)='2014-04-02' THEN BValue ELSE 0 end) as EndingBalance请详细描述一下需求

这个表有点大了,建议首先进行表的水平分割,比如将数据按日期分别存储到两个表中,这就是用存储控件换取系性能的提高的做法,然后再在每个表中创建符合需要的索引,进一步提高检索性能。

mysql> select DATE_FORMAT('1997-10-04 22:23:00','%W %M %Y'); -> 'Saturday October 1997' mysql> select DATE_FORMAT('1997-10-04 22:23:00','%H:%i:%s'); -> '22:23:00' mysql> select DATE_FORMAT('1997-10-04 22:23:00','%D %y %a %d %m ...

select W.订单编号,sum(W.数据1) AS Y1,sum(W.数据2) AS Y2,,sum(W.数据3) AS Y3 from 表A AS S ,表B AS W where S.日期

from e191_sporter x --x是e191_sporter的临时表名字, from e191_sporter w,e191_grade y --w y也是 from e191_grade z 这些可以这样写:from e191_grade as z (其中一个作用就是简化写法) y.pno 其实就是e191_grade.pno

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