sql一些常用的方法
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif1：执行另一服务器上的存储过程http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifexec OPENDATASOURCE(
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 'SQLOLEDB',
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 'Data Source=远程ip;User ID=sa;Password=密码'
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif ).库名.dbo.存储过程名
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif2：将资料插入另一服务器上的表中
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifselect * into 本地库名..表名 from OPENDATASOURCE(
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 'SQLOLEDB',
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 'Data Source=远程ip;User ID=sa;Password=密码'
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif ).库名.dbo.表名
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifinsert 本地库名..表名 select * from OPENDATASOURCE(
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 'SQLOLEDB',
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 'Data Source=远程ip;User ID=sa;Password=密码'
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif ).库名.dbo.表名
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif或使用联结服务器:
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifEXEC sp_addlinkedserver '别名','','MSDASQL',NULL,NULL,'DRIVER={SQL Server};SERVER=远程名;UID=用户;PWD=密码;'
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifexec sp_addlinkedsrvlogin @rmtsrvname='别名',@useself='false',@locallogin='sa',@rmtuser='sa',@rmtpassword='密码'
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifGO
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif(请注意上面的两步要同时运行)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif然后你就可以如下：
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifselect * from 别名.库名.dbo.表名
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifinsert 库名.dbo.表名 select * from 别名.库名.dbo.表名
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifselect * into 库名.dbo.新表名 from 别名.库名.dbo.表名
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifgo
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif3:
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif如果在事务里使用连接服务器要加上
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif分布式事务：
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif两边启动dtc
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifset XACT_ABORT on
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifset ANSI_NULL_DFLT_ON on
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifset ANSI_WARNINGS on
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifBEGIN DISTRIBUTED TRANSACTION
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifselect * from OPENDATASOURCE('MSDASQL','DRIVER={SQL Server};SERVER=ip;UID=sa;PWD=密码;').pubs.dbo.jobs
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifcommit tran
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifselect stockinid,stockindt from stockin as a where a.stockinid in (select b.stockinid from stockindta as b)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifCONVERT(varchar,p.end_date,121)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 函数 CONVERT（ ） 带有两个变量。第一个变量指定了数据类型和长度。第二个变量指定了要进行转换的字段。
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif SELECT CONVERT(varchar(30),getdate(),101) now
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif <!--StartFragment-->CONVERT的使用方法:
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif////////////////////////////////////////////////////////////////////////////////////////
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif格式:
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifCONVERT(data_type,expression[,style])
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif说明:
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif此样式一般在时间类型(datetime,smalldatetime)与字符串类型(nchar,nvarchar,char,varchar)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif相互转换的时候才用到.
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif例子:
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifSELECT CONVERT(varchar(30),getdate(),101) now
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif结果为
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifnow
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif---------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif09/15/2001
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif/////////////////////////////////////////////////////////////////////////////////////
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifstyle数字在转换时间时的含义如下
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gifStyle(2位表示年份) | Style(4位表示年份) | 输入输出格式
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif- | 0 or 100 | mon dd yyyy hh:miAM(或PM)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif1 | 101 | mm/dd/yy
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif2 | 102 | yy-mm-dd
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif3 | 103 | dd/mm/yy
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif4 | 104 | dd-mm-yy
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif5 | 105 | dd-mm-yy
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif6 | 106 | dd mon yy
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif7 | 107 | mon dd,yy
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif8 | 108 | hh:mm:ss
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif- | 9 or 109 | mon dd yyyy hh:mi:ss:mmmmAM(或PM)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif10 | 110 | mm-dd-yy
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif11 | 111 | yy/mm/dd
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif12 | 112 | yymmdd
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif- | 13 or 113 | dd mon yyyy hh:mi:ss:mmm(24小时制)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif14 | 114 | hh:mi:ss:mmm(24小时制)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif- | 20 or 120 | yyyy-mm-dd hh:mi:ss(24小时制)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif- | 21 or 121 | yyyy-mm-dd hh:mi:ss:mmm(24小时制)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------------------------------------------------------------------------
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif--------数学函数
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 1.绝对值
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select abs(-1) value
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select abs(-1) value from dual
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 2.取整(大)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select ceiling(-1.001) value
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select ceil(-1.001) value from dual
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 3.取整（小）
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select floor(-1.001) value
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select floor(-1.001) value from dual
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 4.取整（截取）
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select cast(-1.002 as int) value
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select trunc(-1.002) value from dual
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 5.四舍五入
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select round(1.23456,4) value 1.23460
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select round(1.23456,4) value from dual 1.2346
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 6.e为底的幂
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select Exp(1) value 2.7182818284590451
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select Exp(1) value from dual 2.71828182
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 7.取e为底的对数
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select log(2.7182818284590451) value 1
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select ln(2.7182818284590451) value from dual; 1
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 8.取10为底对数
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select log10(10) value 1
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select log(10,10) value from dual; 1
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 9.取平方
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select SQUARE(4) value 16
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select power(4,2) value from dual 16
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 10.取平方根
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select SQRT(4) value 2
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select SQRT(4) value from dual 2
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 11.求任意数为底的幂
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select power(3,4) value 81
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select power(3,4) value from dual 81
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 12.取随机数
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select rand() value
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select sys.dbms_random.value(0,1) value from dual;
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 13.取符号
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select sign(-8) value -1
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select sign(-8) value from dual -1
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif ----------数学函数
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 14.圆周率
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:SELECT PI() value 3.1415926535897931
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:不知道
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 15.sin,cos,tan 参数都以弧度为单位
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 例如：select sin(PI()/2) value 得到1（SQLServer）
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 16.Asin,Acos,Atan,Atan2 返回弧度
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 17.弧度角度互换(SQLServer，Oracle不知道)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif DEGREES：弧度-〉角度
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif RADIANS：角度-〉弧度
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif ---------数值间比较
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 18. 求集合最大值
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select max(value) value from
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif (select 1 value
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif union
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif select -2 value
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif union
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif select 4 value
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif union
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif select 3 value)a
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select greatest(1,-2,4,3) value from dual
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 19. 求集合最小值
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select min(value) value from
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif (select 1 value
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif union
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif select -2 value
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif union
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif select 4 value
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif union
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif select 3 value)a
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif O:select least(1,-2,4,3) value from dual
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif 20.如何处理null值(F2中的null以10代替)
http://hgq0011.iyunv.com/Images/OutliningIndicators/None.gif S:select F1,IsNull(F2,10
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