--启用or禁用指定表所有外键约束
alter table tbname NOCHECK constraint all
alter table tbname CHECK constraint all --查看约束
select name , is_disabled from sys.foreign_keys order by name --禁用
ALTER TABLE tbname DISABLE TRIGGER trigname --恢复
ALTER TABLE tbname ENABLE TRIGGER trigname --禁用某个表上的所有触发器
ALTER TABLE tbname DISABLE TRIGGER all --启用某个表上的所有触发器
ALTER TABLE tbname ENABLE TRIGGER all --添加主键
alter table tbname add constraint pk_name primary key(column1,column2)
--添加非聚集主键
alter table tbname add constraint pk_name primary key NONCLUSTERED(column1,column2)
--删除主键
alter table tbname drop constraint pk_name
--添加外键
alter table tbname add constraint fk_name foreign key (fk_column) references pk_tbname(pk_column)
--删除外键
alter table tbname drop constraint fk_name
--添加唯一约束
alter table tbname add constraint uq_colname unique (colname)