sql【索引操作】

语法：
CREATE [索引类型] INDEX 索引名称
ON 表名(列名)
WITH FILLFACTOR = 填充因子值0~100
GO

/*实例*/ 　　

CREATE NONCLUSTERED INDEX Index_NotePage_ShareState --创建一个非聚集索引
ON NDB.dbo.NotePage(ShareState) --为TEST表的TNAME字段创建索引
WITH FILLFACTOR = 30 --填充因子为30%
GO

添加索引
IF EXISTS (SELECT name FROM sysindexes
          WHERE name = ‘IX_writtenExam‘)
   DROP INDEX testtable.IX_writtenExam
/*--笔试列创建非聚集索引：填充因子为％--*/
CREATE NONCLUSTERED INDEX IX_writtenExam
     ON testtable(id)
          WITH FILLFACTOR= 30
GO

 


查询测试
/*-----指定按索引IX_writtenExam 查询----*/
declare @startTime datetime
SET @startTime = GETDATE();
SELECT sum(ID) FROM testtable with (INDEX=IX_writtenExam)
declare @endtime datetime
SET @endtime = GETDATE();
print datediff(ms,@startTime,@endtime)

SELECT sum(ID) FROM testtable

 

 


添加数据
SET IDENTITY_INSERT TestTable ON
declare @i int
set @i=1
while @i<=400000
begin
    insert into TestTable([id], FirstName, LastName, Country,Note) values(@i, ‘FirstName_XXX‘,‘LastName_XXX‘,‘Country_XXX‘,‘Note_XXX‘)
    set @i=@i+1
end
SET IDENTITY_INSERT TestTable OFF