取出SQL SERVER字段中的数字

 1 CREATE function GetNumberChar(@col varchar(100)) 
 2 returns varchar(20)
 3 as 
 4 begin 
 5 declare @len int,@i int,@rtn varchar(20) 
 6 set @rtn='' 
 7 set @len=len(@col) 
 8 set @i=1 
 9 while @i <=@len 
10 begin 
11   if isnumeric(substring(@col,@i,1))=1    
12   begin 
13      set @rtn=@rtn+substring(@col,@i,1) 
14  end  
15   set @i=@i+1
16 end 
17 
18 if @rtn = '' 
19    set @rtn='0'
20 
21 return @rtn
22    
23 end 
24 
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