Sql Server 批量修改表格字段+清理表数据--sql语句实现_sql server怎么批量修改1亿数据表的某个字段

declare @sql varchar(300)
     declare @tablecolumnname varchar(100), @columnname varchar(100)
     declare cursor1 cursor for         
    SELECT    '表名' 'tablecolumnname',a.name columnname  FROM syscolumns a  
inner join sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties' 
 where d.name='表名' and a.colorder>1 and a.colorder<38  --仅修改第2至第37个字段
    
      open cursor1                       
     fetch next from cursor1 into @tablecolumnname,@columnname
     while @@fetch_status=0           
     begin
         set @sql='sp_rename '''+@tablecolumnname+'.'+@columnname+''','''+lower( SUBSTRING(@columnname,1,1))+SUBSTRING(@columnname,2,LEN(@columnname)) +''',''column''' -- 此为修改为大写，如果修改为小写“lower”
         print @sql 
         exec(@sql)             
         fetch next from cursor1 into @tablecolumnname,@columnname
     end
     close cursor1                   
     deallocate cursor1

获取表格需要修改的字段：

SELECT    '表名' 'tablecolumnname',a.name columnname  FROM syscolumns a  
inner join sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties' 
 where d.name='表名' and a.colorder>1 and a.colorder<38  --仅修改第2至第37个字段

批量清理表数据

     declare @sql varchar(300)
     declare @tablecolumnname varchar(100) 
     declare cursor1 cursor for         
    Select Name FROM esldatamanager..SysObjects Where XType='U' orDER BY Name   
      open cursor1                       
     fetch next from cursor1 into @tablecolumnname 
     while @@fetch_status=0           
     begin
         set @sql='truncate table  '+@tablecolumnname --清理表语句
         print @sql 
         exec(@sql)             
         fetch next from cursor1 into @tablecolumnname 
     end
     close cursor1                   
     deallocate cursor1