SQL删除主键

--删除主键
Declare @Pk varChar(100);
Select @Pk=Name from sysobjects 
where Parent_Obj=OBJECT_ID(‘SwtoolsUpdateRecord‘) 
and xtype=‘PK‘;
if @Pk is not null
exec(‘Alter table SwtoolsUpdateRecord Drop ‘+ @Pk)
--重新设置主键
ALTER Table SwtoolsUpdateRecord 
ADD CONSTRAINT pkName PRIMARY KEY (ID)
--查看当前主键值
DBCC   CHECKIDENT   (SwtoolsUpdateRecord)
--将当前主键值归0
DBCC   CHECKIDENT   (SwtoolsUpdateRecord,   RESEED,   0)