动态SQL字符串连接有异常

动态SQL字符串连接有错误
如下代码中，@condition变量链接出错了，该怎么先定义好再在SQL中引用呢？

SQL code

  declare @sql varchar(2000),@condition varchar(2000)  set @sql='' set @condition='where nclassid=36 and nexamid=19 and nschoolid=1'  select @sql=@sql+'max(case scoursename when '''+scoursename+''' then descore else 0 end) '+scoursename+','  from (select distinct scoursename from t_card_course   where id in (select ncourseid from t_card_examcou ''''+@condition+'''' )) aexec('select name as 姓名,'+ @sql+ '          sum(descore) descoreinto #tempfrom(    select b.name ,a.descore,c.scoursename    from t_card_score a,t_stu b,t_card_course c,t_card_examcou d    where    a.nstuid=b.id and    a.ncouexamid in (select id from t_card_examcou '''+@condition+''') and    a.ncouexamid=d.id and     d.ncourseid=c.id    group by b.name,a.descore,c.scoursename)as agroup by nameselect *,place=(select count(descore) from #temp where descore>x.descore)+1from #temp xorder by place') 

SQL code

--动态语句语法/******************************************************************************************************************************************************动态语句语法:exec\sp_executesql语法整理人：中国风(Roy)日期:2008.06.06******************************************************************************************************************************************************/动态语句语法:--方法1查询表改为动态select * from sysobjectsexec('select ID,Name from sysobjects')exec sp_executesql N'select ID,Name from sysobjects'--多了一个N为unicode--方法2:字段名，表名，数据库名之类作为变量时,用动态SQL declare @FName varchar(20)set @FName='ID'exec('select '+@FName+' from sysobjects where '+@FName+'=5' )declare @s varchar(1000)set @s=N'select '+@FName+' from sysobjects where '+@FName+'=5'exec sp_executesql @s--会报错declare @s nvarchar(1000)--改为nvarcharset @s=N'select '+@FName+' from sysobjects where '+@FName+'=5'exec sp_executesql @s--成功--方法3:输入参数declare @i int,@s nvarchar(1000)set @i=5exec('select ID,Name from sysobjects where ID='+@i)set @s='select ID,Name from sysobjects where ID=@i'exec sp_executesql @s,N'@i int',@i--此处输入参数要加上N--方法4:输出参数declare @i int,@s nvarchar(1000)set @s='select @i=count(1) from sysobjects'--用execexec('declare @i int '+@s+' select @i')--把整个语句用字符串加起来执行--用sp_executesqlexec sp_executesql @s,N'@i int output',@i output--此处输出参数要加上Nselect @i--方法5:输入输出--用sp_executesqldeclare @i int,@con int,@s nvarchar(1000)set @i=5select @s='select @con=count(1) from sysobjects where ID>@i'exec sp_executesql @s,N'@con int output,@i int',@con output ,@i select @con--用execdeclare @i int,@s nvarchar(1000)set @i=5select @s='declare @con int select @con=count(1) from sysobjects where ID>'+rtrim(@i)+' select @con'exec(@s)
[解决办法]
太長了。。。
select @sql=@sql+'max(case scoursename when '''+scoursename+''' then descore else 0 end) '+scoursename+','
 from (select distinct scoursename from t_card_course  
 where id in (select ncourseid from t_card_examcou ''''+@condition+'''' )) a
這一段也屬于一個動態的sql,應該也是需要exec（@sql）才能把這一段的值賦給@sql,帶到下一段。
可在每次exec前先print @sql查看該語句是否符合預期。
[解决办法]
SQL code
  declare @sql varchar(2000),@condition varchar(2000)  set @sql='' set @condition='where nclassid=36 and nexamid=19 and nschoolid=1'  select @sql=@sql+'max(case scoursename when '''+scoursename+''' then descore else 0 end) '+scoursename+','  from (select distinct scoursename from t_card_course   where id in (select ncourseid from t_card_examcou '''+@condition+''' )) a
[解决办法]
select ncourseid from t_card_examcou '''+@condition+''' 
 
[解决办法]
同意中国风的
[解决办法]
你可以用PRINT(@sql)把你的SQL打印出来看是否有问题就知道错误在哪里了。