时间:2021-11-09 11:37:10 | 栏目:PostgreSQL | 点击:次
序列绑定字段与不绑定字段的区别
drop sequence if exists test_id_seq; create sequence test_id_seq; drop table if exists test; create table test(id int default nextval('test_id_seq'), name text); alter sequence test_id_seq owned by test.id;
test=# drop table test; DROP TABLE test=# \d Did not find any relations. test=#
drop sequence if exists test_id_seq; create sequence test_id_seq; drop table if exists test; create table test(id int default nextval('test_id_seq'), name text);
test=# drop table test; DROP TABLE test=# \d List of relations Schema | Name | Type | Owner --------+-------------+----------+---------- public | test_id_seq | sequence | postgres (1 row) test=#
序列绑定字段,则删除表的时候,序列会被一并删除
序列不绑定字段,则序列与表是独立的,删除表不会将序列一并删除
补充:PG表中字段使用序列类型以及绑定序列实例
两种方法效果是一样的
直接看代码