(编辑:jimmy 日期: 2024/12/25 浏览:2)
如下所示:
-- 建表 CREATE TABLE if not exists public.user ( id character varying(32) NOT NULL DEFAULT sys_guid(), name character varying(100) NOT NULL, gender character varying(50) NOT NULL, age character varying(10) NOT NULL, id_no character varying(50) NOT NULL, created_date timestamp without time zone DEFAULT now(), created_by character varying(100) DEFAULT 'system', updated_date timestamp without time zone DEFAULT now(), update_by character varying(100) DEFAULT 'system', CONSTRAINT user_pkey PRIMARY KEY (id) )with (oids = false); -- 注释 COMMENT ON TABLE public.user IS '用户表'; COMMENT ON COLUMN public.user.id IS '主键'; COMMENT ON COLUMN public.user.name IS '姓名'; COMMENT ON COLUMN public.user.gender IS '性别'; COMMENT ON COLUMN public.user.age IS '年龄'; COMMENT ON COLUMN public.user.id_no IS '身份证号'; COMMENT ON COLUMN public.user.created_date IS '创建时间'; COMMENT ON COLUMN public.user.created_by IS '创建人'; COMMENT ON COLUMN public.user.updated_date IS '更新时间'; COMMENT ON COLUMN public.user.update_by IS '更新人'; -- 主键 (如果建表语句里面没添加主键就执行该语句) alter table public.user add constraint user_pkey primary key (id); -- 索引或唯一索引 drop index if exists user_name; CREATE INDEX user_name ON user (name); drop index if exists user_id_no; CREATE UNIQUE INDEX user_id_no ON user (id_no); -- 授权 GRANT ALL ON TABLE public.user TO mydata; GRANT SELECT, UPDATE, INSERT, DELETE ON TABLE public.user TO mydata_dml; GRANT SELECT ON TABLE public.user TO mydata_qry;
补充:postgresql基本功能:创建表、新增列、修改列字段名称、某列值自增或循环自增、
根据现有表创建新表:
CREATE TABLE "test04" AS ( select * from testdemo);
修改数据表名:
alter table table_name(表名) rename to new_table_name(新表名)
新增列字段:
ALTER TABLE test04 ADD gid1_type integer;
删除列字段:
ALTER TABLE test04 DROP COLUMN gid1_type;
修改列字段名称:
alter table test05 RENAME "gid" TO "id";
修改列字段类型:
ALTER TABLE test05 ALTER COLUMN "gid" TYPE datatype;
特殊的修改为integer:
alter table table_name(表名) alter column 字段名 type 新字段类型 using to_number(字段名,'9')
更新字段数据:
update test05 set "gid1_type" = 0 where ("组分类型1" = '消防栓') or ("组分类型1" = '水表') or ("组分类型1" = '节点');
在postgresql中,设置已存在的某列(num)值自增:
//将表tb按name排序,利用row_number() over()查询序号并将该列命名为rownum,创建新表tb1并将结果保存到该表中 create table tb1 as (select *, row_number() over(order by name) as rownum from tb); //根据两张表共同的字段name,将tb1中rownum对应值更新到tb中num中 update tb set num=(select tb1.rownum from tb1 where tb.name = tb1.name); //判断表tb1的存在并删除表 drop table if exists tb1;
在postgresql中,循环设置已存在的某列(num)值为0-9:
//将表tb按name排序,利用row_number() over()查询序号并将该列命名为rownum,创建新表tb1并将结果保存到该表中 create table tb1 as (select *, row_number() over(order by name) as rownum from tb); //根据两张表共同的字段name,将tb1中rownum对应值更新到tb中num中,由于为0-9循环自增,则%10 update tb set num=(select tb1.rownum from tb1 where tb.name = tb1.name) % 10; //判断表tb1的存在并删除表 drop table if exists tb1;
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。如有错误或未考虑完全的地方,望不吝赐教。