如何选择出一条记录有多少个数据(这条记录的非空数据的列数)?

[sky592]

如何选择出一条记录有多少个数据(这条记录的非空数据的列数)?

[qingfengsishi]

系统存储过程sp_help 中可以读取该表一共有几个字段,我都没写过这样的语句，学习ing~
呵呵，:)

[benxie]

up

[Benimarunikado]

首先，建立存储过程：


CREATE procedure GetField @tablename char(30), @alias varchar(10) = ''
as
declare @list varchar(500), @list1 varchar(500) -- 长度不够时用list1
select @list = ''
select @list1=''
declare @id int
declare @fieldname varchar(30)
select @id = id from sysobjects where name = @tablename
declare mycur cursor for select name from syscolumns where id = @id
open mycur
fetch next from mycur into @fieldname
WHILE (@@FETCH_STATUS = 0 )
BEGIN
if @alias <> ''
begin
select @fieldname = @alias + '.' + @fieldname
end
if (len(@list1)>0) or (len(@list)+len(@fieldname)>252)
begin
select @list1 = @list1 + @fieldname
select @list1 = @list1 + ','
end
else
begin
select @list = @list + @fieldname
select @list = @list + ','
end
fetch next from mycur into @fieldname
END
close mycur
deallocate mycur
if len(@list1)>0
select @list1 = substring(@list1, 1, len(@list1)-1)
else
select @list = substring(@list, 1, len(@list)-1)
select @list, @list1


如何就可以用存储过程来调用字段了——
语法：
getfield yourtablename

[Rotaxe]

select (case(列1 is null)then 0 else 1 end + case(列2 is null)then 0 else 1 end +...... ) 数据个数 from 表

[pengdali]

select case when 列1 is null then 0 else 1 end+case when 列2 is null then 0 else 1 end+...... as 非空数据个数 from 表