postgresql 修改表结构，添加索引

POSTGResql 修改表结构，添加索引

//添加一个表字段 testuser=> alter table test add sex Integer; alter table testuser=> \d test table "public.test" column | Type | ModifIErs --------------+-----------------------+--------------------------------------------------- ID | Integer | not null default nextval('seq_test_ID'::regclass) name | character varying(32) | date_created | date | sex | Integer | Indexes: "testuser_iD_pk" PRIMary KEY,btree (ID) //修改表字段类型 testuser=> alter table test alter sex type varchar(1); alter table testuser=> \d test table "public.test" column | Type | ModifIErs --------------+-----------------------+--------------------------------------------------- ID | Integer | not null default nextval('seq_test_ID'::regclass) name | character varying(32) | date_created | date | sex | character varying(1) | Indexes: "testuser_iD_pk" PRIMary KEY,btree (ID) //创建唯一索引 testuser=> create unique index unique_name on test(Name); CREATE INDEX testuser=> \d test table "public.test" column | Type | ModifIErs --------------+-----------------------+--------------------------------------------------- ID | Integer | not null default nextval('seq_test_ID'::regclass) name | character varying(32) | date_created | date | sex | character varying(1) | Indexes: "testuser_iD_pk" PRIMary KEY,btree (ID) "unique_name" UNIQUE,btree (Name) //表字段改名 testuser=> alter table test rename sex to age; alter table testuser=> \d test table "public.test" column | Type | ModifIErs --------------+-----------------------+--------------------------------------------------- ID | Integer | not null default nextval('seq_test_ID'::regclass) name | character varying(32) | date_created | date | age | character varying(1) | Indexes: "testuser_iD_pk" PRIMary KEY,btree (Name) //删除表字段 testuser=> alter table test drop age; alter table