T-SQL检测表无用字段

把所有字段中，如果某些字段全是0或者全是空或者全是“null”的过滤掉，把空的字段名称和长度显示出来，如果要显示非空的字段隐藏空的可以把not exists的not去掉就可以了
 

CREATE PROCEDURE dbo.sp_chk_no_used_field
@tname as varchar(266) --检测表中无用字段 by Sgxcn 2011.9
AS
BEGIN
declare @fname nvarchar(255)
declare curField cursor for
SELECT name FROM Syscolumns WHERE ID=OBJECT_ID(@tname) and name is not NULL

create table ##temp (name nvarchar(255))

open curField
FETCH NEXT FROM curField into @fname
WHILE @@FETCH_STATUS = 0
BEGIN
DECLARE @SQL as NVARCHAR(255)
--如果要显示非空的字段隐藏空的可以把not exists的not去掉就可以了
SET @SQL = ''if not exists(select * from ''+@tname+ '' where ('' + @fname + '' is not null) or ('' + @fname + '' <> '''''''') or ('' + @fname + '' <> 0)) insert into ##temp values(''''''+@fname+ '''''')''
EXEC sp_executesql @SQL
FETCH NEXT FROM curField into @fname
END
CLOSE curField
DEALLOCATE curField

SELECT [name], [length] FROM Syscolumns WHERE ID=OBJECT_ID(@tname) and name in (SELECT [name] FROM ##temp)

drop table ##temp
END
GO

调用示例

exec sp_chk_no_used_field ''表名''