mysql主键创建与修改常用sql语句

alter table table1 add transactor varchar(10) not Null;
alter table   table1 add id int unsigned not Null auto_increment primary key

declare @defname varchar(100)
declare @cmd varchar(500)
declare @tablename varchar(100)
declare @keyname varchar(100)
Set @tablename='Temp1'
Set @keyname='id' --需要設置的key,分隔
select @defname= name
   FROM sysobjects so
   JOIN sysconstraints sc
   ON so.id = sc.constid
   WHERE object_name(so.parent_obj) = @tablename
   and xtype='PK'
if @defname is not null
begin
select @cmd='alter table '+ @tablename+ ' drop constraint '+ @defname
--print @cmd
   exec (@cmd)
 end
else
 set @defname='PK_'+@keyname
select @cmd='alter table '+ @tablename+ ' ADD constraint '+ @defname +' PRIMARY KEY CLUSTERED('+@keyname+')'
   exec (@cmd)
 

--1:
SELECT TABLE_NAME,COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
WHERE TABLE_NAME<>'dtproperties'

--2:
EXEC sp_pkeys @table_name='表名'

--3:
select o.name as 表名,c.name as 字段名,k.colid as 字段序号,k.keyno as 索引顺序,t.name as 类型
from sysindexes i
join sysindexkeys k on i.id = k.id and i.indid = k.indid
join sysobjects o on i.id = o.id
join syscolumns c on i.id=c.id and k.colid = c.colid
join systypes t on c.xusertype=t.xusertype
where o.xtype = 'U' and o.name='要查询的表名'
and exists(select 1 from sysobjects where xtype = 'PK' and parent_obj=i.id and name = i.name)
order by o.name,k.colid