pgsql添加自增序列

1.創建一張表

CREATE TABLE "public"."tt" (

"name" varchar(128), 
"status" int4 DEFAULT 2, 
"id" int8 NOT NULL, 
CONSTRAINT "tt_pkey" PRIMARY KEY ("id") 
) 
WITH (OIDS=FALSE) ; 
ALTER TABLE "public"."tt" OWNER TO "postgres"; 
2.創建與表對應的自增序列 
CREATE SEQUENCE tt_id_seq 
    START WITH 1 
    INCREMENT BY 1 
    NO MINVALUE 
    NO MAXVALUE 
    CACHE 1; 
ALTER TABLE public.tt_id_seq OWNER TO postgres; 

#最重要的，不執行下面這句的話，導出的sql.json中id的sequence值會爲null

ALTER SEQUENCE tt_id_seq OWNED BY tt.id; 
ALTER table tt  ALTER column id set default nextval('tt_id_seq'); 
SELECT pg_catalog.setval('tt_id_seq', 1, false); 
發現sequence不存在的情況 

解決思路：刪除相關表和依賴進行重建

序列類型
         CREATETABLE t (id SERIAL); 
         等價於 
         CREATE SEQUENCE t_id_seq; 
         CREATE TABLE t ( id integer NOT NULL DEFAULT nextval(‘t_id_seq’) ); 
         ALTER SEQUENCE t_id_seq OWNED BY t_id; 

重置序列：

SELECT setval(pg_get_serial_sequence('tt', 'id'), coalesce(max(id),0) + 1, false) FROM tt;