alter table docdsp  add dspcode char(200)

ALTER TABLE table_NAME DROP COLUMN column_NAME

ALTER TABLE table_name  ALTER COLUMN column_name new_data_type

sp_rename [ @objname = ] 'object_name' ,
    [ @newname = ] 'new_name'
    [ , [ @objtype = ] 'object_type' ]

--假設要處理的表名為: tb

--判斷要添加列的表中是否有主鍵
if exists(select 1 from sysobjects where parent_obj=object_id('tb') and xtype='PK')
begin
print '表中已經有主鍵,列只能做為普通列添加'

--添加int類型的列,默認值為0
alter table tb add 列名 int default 0
end
else
begin
print '表中無主鍵,添加主鍵列'

--添加int類型的列,默認值為0
alter table tb add 列名 int primary key default 0
end
/**************************************************************************************/

if exists(select * from syscolumns where id=object_id('table1') and name='name') begin
select * from people;
end