请问可以根据记录作为表名进行查询吗？

[zzutnicholas]

create table tb6(类号 varchar(10) , 表名 varchar(10)) 
insert into tb6 values('CB' , 'tb4') 
insert into tb6 values('CC' , 'tb5') 
go
create table tb5( 数据A int , 数据B int) 
insert into tb5 values(13 , 11 ) 
insert into tb5 values(24 , 12 ) 
insert into tb5 values(36 , 13 ) 
insert into tb5 values(47 , 213) 
insert into tb5 values(48 , 123) 
go
create table tb4( 数据 int) 
insert into tb4 values( 53 )
insert into tb4 values(99 )
insert into tb4 values(454 )
insert into tb4 values( 434) 
insert into tb4 values(99 )
insert into tb4 values(994 )

希望效果：
CC
数据A 数据B
----------- -----------
13 11
24 12
36 13
47 213
48 123

谢谢回帖！

[dobear_0922]

写动态SQL语句吧

[水族杰纶]

set nocount on 
if object_id('tb6')is not null drop table tb6
go
create table tb6(类号 varchar(10) , 表名 varchar(10)) 
insert into tb6 values('CB' , 'tb4') 
insert into tb6 values('CC' , 'tb5') 
go
if object_id('tb5')is not null drop table tb5
go
create table tb5( 数据A int , 数据B int) 
insert into tb5 values(13 , 11 ) 
insert into tb5 values(24 , 12 ) 
insert into tb5 values(36 , 13 ) 
insert into tb5 values(47 , 213) 
insert into tb5 values(48 , 123) 
go
if object_id('tb4')is not null drop table tb4
go
create table tb4( 数据 int) 
insert into tb4 values( 53 )
insert into tb4 values(99 )
insert into tb4 values(454 )
insert into tb4 values( 434) 
insert into tb4 values(99 )
insert into tb4 values(994 )
declare @s varchar(1000)
select @s=isnull(@s,'')+'select * from ' +  表名 from tb6 where 类号='CC'
exec (@s)
/*数据A         数据B         
----------- ----------- 
13          11
24          12
36          13
47          213
48          123*/

[水族杰纶]

动态sql语句基本语法 
1 :普通SQL语句可以用Exec执行 

eg:   Select * from tableName 
         Exec('select * from tableName') 
         Exec sp_executesql N'select * from tableName'    -- 请注意字符串前一定要加N 

2:字段名，表名，数据库名之类作为变量时，必须用动态SQL 

eg:   
declare @fname varchar(20) 
set @fname = 'FiledName' 
Select @fname from tableName              -- 错误,不会提示错误，但结果为固定值FiledName,并非所要。 
Exec('select ' + @fname + ' from tableName')     -- 请注意 加号前后的 单引号的边上加空格 

当然将字符串改成变量的形式也可 
declare @fname varchar(20) 
set @fname = 'FiledName' --设置字段名 

declare @s varchar(1000) 
set @s = 'select ' + @fname + ' from tableName' 
Exec(@s)                -- 成功 
exec sp_executesql @s   -- 此句会报错 



declare @s Nvarchar(1000)  -- 注意此处改为nvarchar(1000) 
set @s = 'select ' + @fname + ' from tableName' 
Exec(@s)                -- 成功     
exec sp_executesql @s   -- 此句正确 

3. 输出参数 
declare @num int, 
        @sqls nvarchar(4000) 
set @sqls='select count(*) from tableName' 
exec(@sqls) 
--如何将exec执行结果放入变量中？ 

declare @num int, 
               @sqls nvarchar(4000) 
set @sqls='select @a=count(*) from tableName ' 
exec sp_executesql @sqls,N'@a int output',@num output 
select @num 

[liangCK]

DECLARE @classname varchar(10)
DECLARE @tb_name varchar(10)

SET @classname='CC'

EXEC sp_executesql N'SELECT @tb_name=表名 FROM tb6 WHERE 类号=@classname',
                   N'@classname varchar(10),@tb_name varchar(10) output',
                   @classname,@tb_name output

EXEC('SELECT * FROM ['+@tb_name+']');

[冷箫轻笛]

declare @sql varchar(1000)
select @sql = ''

select @sql = 'select * from ' + 表名
from tb6
where 类号 = 'CC'

exec (@sql)

[hyde100]

create table tb6(类号 varchar(10) , 表名 varchar(10)) 
insert into tb6 values('CB' , 'tb4') 
insert into tb6 values('CC' , 'tb5') 
go
create table tb5( 数据A int , 数据B int) 
insert into tb5 values(13 , 11 ) 
insert into tb5 values(24 , 12 ) 
insert into tb5 values(36 , 13 ) 
insert into tb5 values(47 , 213) 
insert into tb5 values(48 , 123) 

declare @tb varchar(50)
select @tb = 表名 from tb6
where 表名= 'tb5'
print 'select * from ' + @tb
exec('select * from ' + @tb )

结果：13	11
24	12
36	13
47	213
48	123

[csdyyr]

create table tb6(类号 varchar(10) , 表名 varchar(10)) 
insert into tb6 values('CB' , 'tb4') 
insert into tb6 values('CC' , 'tb5') 
go
create table tb5( 数据A int , 数据B int) 
insert into tb5 values(13 , 11 ) 
insert into tb5 values(24 , 12 ) 
insert into tb5 values(36 , 13 ) 
insert into tb5 values(47 , 213) 
insert into tb5 values(48 , 123) 
go
create table tb4( 数据 int) 
insert into tb4 values( 53 )
insert into tb4 values(99 )
insert into tb4 values(454 )
insert into tb4 values( 434) 
insert into tb4 values(99 )
insert into tb4 values(994 )

declare @sql varchar(8000)
select @sql='select * from ' + 表名 
from TB6 
where 类号='CC'

exec(@sql)

drop table tb6
drop table tb5
drop table tb4
/*
数据A         数据B         
----------- ----------- 
13          11
24          12
36          13
47          213
48          123
*/

[claro]

帮顶

[jimoshatan]

create table tb6(类号 varchar(10) , 表名 varchar(10)) 
insert into tb6 values('CB' , 'tb4') 
insert into tb6 values('CC' , 'tb5') 
go
create table tb5( 数据A int , 数据B int) 
insert into tb5 values(13 , 11 ) 
insert into tb5 values(24 , 12 ) 
insert into tb5 values(36 , 13 ) 
insert into tb5 values(47 , 213) 
insert into tb5 values(48 , 123) 
go
create table tb4( 数据 int) 
insert into tb4 values( 53 )
insert into tb4 values(99 )
insert into tb4 values(454 )
insert into tb4 values( 434) 
insert into tb4 values(99 )
insert into tb4 values(994 )

declare @ser varchar(10)
declare @table varchar(10)
set @ser='cc'
set @table =(select 表名 from tb6 where 类号=@ser)

exec('select * from '+@table)


drop table tb6,tb5,tb4

[ChinaJiaBing]

declare @sql nvarchar(100)
set @sql='select * from'

select @sql=@sql+ ' '+表名 from tb6 where 类号='cc'
exec (@sql)
13	11
24	12
36	13
47	213
48	123

[bluefangxiao]

declare @sql varchar(20)
set @sql=''
select @sql='select * from '+表名 from tb6 where 类号='CC'
print @sql
exec(@sql)