【SQL Server 学习系列】-- SQL查询数据库表字段值不为空或Null的所有列

 declare @TableName nvarchar(200)
 set @TableName = 'Agency'   -- 表名

 declare @querySql nvarchar(max)
 set @querySql = 'select '

 declare @col varchar(50)
 declare My_Cursor cursor
 for(select name from syscolumns where  id = (select max(id) from sysobjects where xtype = 'u' and name = '' + @TableName + '' ) )
 open My_Cursor;
 fetch next from My_Cursor into @col;
 while @@FETCH_STATUS = 0
     begin
         declare @sql varchar(2000)
         declare @TempTable TABLE(NAME NVARCHAR(2000))
         delete from @TempTable
         set @sql='SELECT '+ @col +' FROM '+@TableName+''

         insert @TempTable
         exec(@sql)

         -- if not exists (select NAME from @TempTable where len(NAME)>0 group by NAME)    --查询字段值全为空或NULL的列
         if exists (select count(1) from @TempTable where isnull(NAME, '')<> '') -- 查询字段值不全为空或NULL的列
             begin
                 set @querySql = @querySql + @col + ', '
             end 

         fetch next from My_Cursor into @col;
     end
 close My_Cursor; --关闭游标
 deallocate My_Cursor; --释放游标   

 if @querySql <> 'select '
     begin
         set @querySql = left(@querySql, len(@querySql) - 1)
         set @querySql = @querySql + ' from ' + @TableName + ''
         print (@querySql)

         exec(@querySql)
     end