SQL中如何用一个表更新另一个表
for ACCESS :
update a, b set a.name=b.name1 where a.id=b.id
for SQL Server:
"update a set a.name=b.name1 from a,b where a.id=b.id"
update a set a.status=b.status
from table1 a,table2 b
where a.id1=b.id1
update a inner join b on a.a1=b.b1 set a.a2=b.b2条件
update table1 set a.status = b.status
from table1 a inner join table2 b
on a.idl = b.idl
http://topic.csdn.net/t/20041013/14/3451961.html
http://www.cnblogs.com/hanguoji/archive/2007/02/01/636723.aspx
相关文档：
---------数学函数
1.绝对值
S:select abs(-1) value
O:select abs(-1) value from dual
2.取整(大)
S:select ceiling(-1.001) value
O:select ceil(-1.001) value from dual
3.取整（小）
S:select floor(-1.001) value
O:select floor(-1.001) value from dual
4.取整（截取）
S:select cast(-1.002 as int) v ......
alter table 表名
add constraint 约束名
foreign key(字段名) references 主表名(字段名)
on delete cascade
语法：
Foreign Key
(column[,...n])
references referenced_table_name[(ref_column[,...n])]
[on delete cascade]
[on update cascade]
注释：
column:列名
referenced_table_name:外键参考的主键� ......
首先要有jxl类库。
程序如下：
import java.io.*;
import jxl.*;
public class ExcelToSql {
public static void main(String args[])
{
try
{
Workbook book= Workbook.getWorkbook(new File("D:\\workspaceuse6\\foundation\\test\\com\\gres ......
select name from syscolumns where id in (select id from sysobjects where type = 'u' and name = '相应表名')
用以上sql语句输入相应表名就可以查到表的字段名，对应好数据库 查询是否存在该表语句
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[tb_cost]') and OBJECTPROPER ......
*
sql xml 入门:
--by jinjazz
--http://blog.csdn.net/jinjazz
1、xml: 能认识元素、属性和值
2、xpath: 寻址语言，类似wind ......
