SQL SERVER 的小技巧

bco

http://zu14.iyunv.com/Images/OutliningIndicators/None.gif运算符的优先顺序
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif当一个复杂的表达式有多个运算符时，运算符优先性决定执行运算的先后次序。执行的顺序可能严重地影响所得到的值。
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif运算符有下面这些优先等级。在较低等级的运算符之前先对较高等级的运算符进行求值。 
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif+（正）、-（负）、~（按位 NOT）
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif*（乘）、/（除）、%（模）
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif+（加）、（+ 串联）、-（减）
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif=,  >,  <,  >=,  <=,  <>,  !=,  !>,  !< 比较运算符
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif^（位异或）、&（位与）、|（位或）
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gifNOT
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gifAND
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gifALL、ANY、BETWEEN、IN、LIKE、OR、SOME
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif=（赋值） 
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif


运算符， 不常用的 二进制 运算符，在某些方面也有独特的用处，例如： 正^正＝正 ... ...

http://zu14.iyunv.com/Images/OutliningIndicators/None.gif--建一张和某（几）张表结构相同的表
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gifSELECT * INTO [新表] FROM [源表] WHERE 1 = 0
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://zu14.iyunv.com/Images/OutliningIndicators/ContractedBlock.gif/**//*此种方式建立的表，只有基本的结构，主键等的附加信息都没有了*/


http://zu14.iyunv.com/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://zu14.iyunv.com/Images/OutliningIndicators/ContractedBlock.gif/**//* 一些特殊的排序方法 */
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif-- 1. 
http://zu14.iyunv.com/Images/OutliningIndicators/None.gifselect * from table
http://zu14.iyunv.com/Images/OutliningIndicators/None.giforder by 
http://zu14.iyunv.com/Images/OutliningIndicators/None.gifcase id 
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif when 4 then 1
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif when 5 then 0
http://zu14.iyunv.com/Images/OutliningIndicators/None.gifend
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif-- 2.
http://zu14.iyunv.com/Images/OutliningIndicators/None.gifSELECT * FROM table 
http://zu14.iyunv.com/Images/OutliningIndicators/None.gifORDER BY id % 5
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif-- 3.
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gifSELECT * FROM table
http://zu14.iyunv.com/Images/OutliningIndicators/None.gifORDER BY RIGHT(id, 3)
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif
http://zu14.iyunv.com/Images/OutliningIndicators/None.gif-------------------------------
http://zu14.iyunv.com/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://zu14.iyunv.com/Images/OutliningIndicators/ContractedBlock.gif/**//* 总之，就是一些变通的思路 */