postgreSQL的常用语法

Posted 2021-09-03 JAVA_IN_LIFE

postgreSQL的常用语法

• 创建数据库表的sql语句：

  CREATE TABLE "public"."tb_test"
  (

    "id" int8 NOT NULL,
    "title"     varchar(50) COLLATE "pg_catalog"."default",
    "ip"        varchar(50) COLLATE "pg_catalog"."default",
    "param"     varchar(500) COLLATE "pg_catalog"."default",
    "result"    varchar(500) COLLATE "pg_catalog"."default",
    "type"      varchar(10) COLLATE "pg_catalog"."default" NOT NULL,
    "create_by" varchar(30) COLLATE "pg_catalog"."default",
    "create_time" timestamptz(6),
    "update_by" varchar(30) COLLATE "pg_catalog"."default",
    "update_time" timestamptz(6),
    "remark"    varchar(500) COLLATE "pg_catalog"."default",
    CONSTRAINT "cgm_third_docking_log_pkey" PRIMARY KEY ("id")

  )
  ;

  COMMENT ON COLUMN "public"."tb_test"."id" IS \'主键ID\';
  COMMENT ON COLUMN "public"."tb_test"."title" IS \'模块标题\';
  COMMENT ON COLUMN "public"."tb_test"."ip" IS \'ip地址\';
  COMMENT ON COLUMN "public"."tb_test"."param" IS \'请求参数\';
  COMMENT ON COLUMN "public"."tb_test"."result" IS \'返回结果\';
  COMMENT ON COLUMN "public"."tb_test"."type" IS \'type\';
  COMMENT ON COLUMN "public"."tb_test"."create_by" IS \'创建人\';
  COMMENT ON COLUMN "public"."tb_test"."create_time" IS \'创建时间\';
  COMMENT ON COLUMN "public"."tb_test"."update_by" IS \'更新人\';
  COMMENT ON COLUMN "public"."tb_test"."update_time" IS \'更新时间\';
  COMMENT ON COLUMN "public"."tb_test"."remark" IS \'备注\';
  COMMENT ON TABLE "public"."tb_test" IS \'test日志表 \';

• 新增表字段的sql语句：

  ALTER TABLE tb_test ADD COLUMN dealer_code VARCHAR(20)   COLLATE "pg_catalog"."default";
  COMMENT ON COLUMN "tb_test"."dealer_code" IS \'邀约码\';
  

• 创建表的唯一索引sql

  CREATE UNIQUE INDEX uk_tb_test_type ON tb_test(type);
  

• 创建表的普通索引

  create index idx_tb_test_id_ip on tb_test (id desc, ip desc);

• 修改表字段的名称sql

  alter table tb_test rename column "result" to "Result";
  
  或者(需要存在Result字段)
  
  alter table tb_test rename column "Result" to "result";
  

• 修改表字段的类型sql

  alter table tb_test alter column id type int8;
  alter table tb_test alter id set not null;
  alter table tb_test alter column pid type int8;
  

• 表添加jsonb的字段sql

  ALTER TABLE tb_test ADD COLUMN followed_other_info jsonb DEFAULT \'{}\';
  COMMENT ON COLUMN "tb_test"."followed_other_info" IS \'xxxx其他信息\';
  

• 表权限赋予用户sql

  alter table tb_test owner to xxx_user;

• 插入语句sql

  INSERT INTO "public"."tb_region_code" VALUES (100000, \'中国\', 0, \'中国\', 0, \'\', \'\', \'中国\', 116.368, 39.9151, \'China\');

• 清除表的全部数据，保留表结构sql

  truncate table "public"."tb_test";

• 修改列的长度的sql

  ALTER TABLE "public"."tb_test" ALTER COLUMN "remark" type varchar(300);

• 更新表记录对应列的内容SQL

  UPDATE tb_test SET title = \'xxx\' where id = xxxxx

• 删除创建序列的sql

  DROP SEQUENCE IF EXISTS "public"."gen_table_column_id_seq";

• 创建序列的sql

  DROP SEQUENCE IF EXISTS "public"."gen_table_id_seq";
  CREATE SEQUENCE "public"."gen_table_id_seq"
  INCREMENT 1
  MINVALUE 1
  MAXVALUE 9223372036854775807
  START 1
  CACHE 1;

• 删除表结构（含内容）的sql

  DROP TABLE IF EXISTS "public"."gen_table_column";

• 添加主键的sql

  ALTER TABLE "public"."tb_test" ADD CONSTRAINT "tb_test_id_pkey" PRIMARY KEY ("id");
  

• 查询当前最新xxx值距当前时间小于等于2h的数据

  SELECT
      user_id,
      device_id,
      latest_time,
      CURRENT_TIMESTAMP current_value
  FROM
      tb_device  where latest_time between (now()::timestamp + \'-2 hour\') and now();