Pgsql建表

Pgsql建表

1，创建表，指定主键并默认自增（从1开始）

DROP TABLE IF EXISTS "tb_test";
CREATE TABLE "public"."tb_test" (
  "id" SERIAL8 NOT NULL,
  "username" varchar(50) COLLATE "pg_catalog"."default",
  "password" varchar(50) COLLATE "pg_catalog"."default",
  "conclusion" varchar(50) COLLATE "pg_catalog"."default",
  "picture" varchar(255) COLLATE "pg_catalog"."default",
  "ext1" varchar(255) COLLATE "pg_catalog"."default",
  "create_time" timestamp(6) DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY ("id")
);
COMMENT ON COLUMN "public"."tb_test"."id" IS '主键';
COMMENT ON COLUMN "public"."tb_test"."username" IS '用户名';
COMMENT ON COLUMN "public"."tb_test"."password" IS '密码';
COMMENT ON COLUMN "public"."tb_test"."conclusion" IS '结论';
COMMENT ON COLUMN "public"."tb_test"."picture" IS '图片';
COMMENT ON COLUMN "public"."tb_test"."ext1" IS '扩展字段1';
COMMENT ON COLUMN "public"."tb_test"."create_time" IS '创建时间';
COMMENT ON TABLE "public"."tb_test" IS '测试表';

序列

//创建自增序列 CREATE SEQUENCE IF NOT EXISTS 表名_指定自增的列_seq START 从数字几开始;
//删除序列 DROP SEQUENCE IF NOT EXISTS 序列名
//修改序列初始值 ALTER SEQUENCE 序列名 RESTART WITH 初始值
//验证序列 SELECT NEXTVAL(‘序列名’);

CREATE SEQUENCE IF NOT EXISTS tb_test_id_seq START 1;
DROP SEQUENCE IF NOT EXISTS tb_test_id_seq;
ALTER SEQUENCE tb_test_id_seq RESTART WITH 1;
SELECT NEXTVAL('tb_test_id_seq');