SQL语句笔记，增加一个字段，统计该表内的数据信息

实例一

表结构：填空选择题选项 (subjectid,id2,optionid,optioncontent,rightkey)

依次对应内容：题号id，空项位置，每空选项号，选项内容，对或错

现在要加一个字段tabnum，统计每到题的选项个数

代码如下


create table #itmpfillchoicetabnum(subjectid varchar(75) null,


tabnum int )




insert into #itmpfillchoicetabnum


select subjectid,count(*)


from 程序填空选择题选项


group by subjectid




--select *


--from #itmpfillchoicetabnum




select X.subjectid,X.id2,X.optionid,X.optioncontent,X.rightkey,Z.tabnum into #result


from 程序填空选择题选项 as X,#itmpfillchoicetabnum as Z


where X.subjectid = Z.subjectid






drop table 程序填空选择题选项


select * into 程序填空选择题选项 from #result

实例二

在一张表里增加一个字段，并且该字段，依次用1,2,3,......赋值

代码


select * , id = identity(int,1,1) into #tmp2 from iiresult


drop table iiresult


select * into iiresult from #tmp