日期:2014-05-18  浏览次数:20603 次

一个关于SQL的字符串的问题

create table facmachine 
(
  facid int ,
  machineid int,
  num int
)
insert into facmachine select 1000,100,10 union all
  select '1000','200',10 union all
  select '2000','100',100 union all
  select '3000', '400',100


select * from facmachine 

declare @sql nvarchar(1000)
set @sql = 'select facid [机型]'
select @sql = @sql+ ','+machineid+'= sum(case machineid when '+[machineid]+' then num else 0 end)' from (select distinct machineid from facmachine) dd
 
set @sql = @sql+', sum(num) as [总计] from facmachine group by facid '
exec (@sql)

drop table facmachine


  这个Sql报'将 varchar 值 '= sum(case machineid when ' 转换为数据类型为 int 的列时发生语法错误。'这个错误,请教专家怎么解....


------解决方案--------------------
machineid 换成convert(varchar(100),machineid)
SQL code

declare   @sql   nvarchar(1000) 
set   @sql     =   'select   facid       [机型] ' 
  select   @sql   =  @sql+   ','''+convert(varchar(100),machineid)+ '''= sum(case   machineid   when   '''+convert(varchar(100),machineid)+ '''   then   num   else   0   end) ' from  (select   distinct   machineid   from   facmachine)   dd 
set   @sql   =   @sql+ ',   sum(num)   as   [总计]   from   facmachine   group   by   facid   ' 
exec   (@sql)

------解决方案--------------------
SQL code
create   table   facmachine   
( 
    facid   int, 
    machineid   int, 
    num   int 
) 

insert   into   facmachine   select   '1000 ', '100 ',10   union   all 
    select   '1000 ', '200 ',10   union   all 
    select   '2000 ', '100 ',100   union   all 
    select   '3000 ',   '400 ',100 

declare   @sql   nvarchar(1000) 
set @sql = 'select facid [机型]' 
select @sql = @sql+ ', sum(case machineid when ''' + cast(machineid as varchar) + ''' then num else 0 end) ['+cast(machineid as varchar)+']'
from (select distinct machineid from facmachine) dd 
set @sql = @sql+ ', sum(num) as [总计] from facmachine group by facid ' 
exec   (@sql) 

/*
机型          100         200         400         总计          
----------- ----------- ----------- ----------- ----------- 
1000        10          10          0           20
2000        100         0           0           100
3000        0           0           100         100

*/

------解决方案--------------------
SQL code
create   table   facmachine   
( 
    facid   int   , 
    machineid   int, 
    num   int 
) 
insert   into   facmachine   select   1000,100,10   union   all 
    select   '1000 ', '200 ',10   union   all 
    select   '2000 ', '100 ',100   union   all 
    select   '3000 ',   '400 ',100 


select   *   from   facmachine   

declare   @sql   nvarchar(1000) 
set   @sql     =   'select   facid       [机型] ' 
select   @sql   =   @sql+   ', ['+cast(machineid as char(20))+ 
']=   sum(case   machineid   when   '+cast([machineid] as varchar(20))+
 '   then   num   else   0   end) '  
 from   (select   distinct   machineid   from   facmachine)   dd 
  
set   @sql   =   @sql+ ',   sum(num)   as   [总计]   from   facmachine   group   by   facid   ' 
exec   (@sql) 
/*


机型          100                  200                  400                  总计          
----------- -------------------- -------------------- -------------------- ----------- 
1000        10                   10                   0                    20
2000        100                  0                    0                    100
3000        0                    0                    100                  100


*/
drop   table   facmachine