Postgresql 常用SQL语句

1 查询表中重复数据

SELECT * FROM "tbScenics"

WHERE "Scenic_Id"

NOT IN (

SELECT max("Scenic_Id")

FROM "tbScenics"

GROUP BY  "Scenic_Name", "Scenic_Des", "Scenic_Price", "Scenic_Ticket"

);

2 删除表中重复数据

DELETE * FROM "tbScenics"

WHERE "Scenic_Id"

NOT IN (

SELECT max("Scenic_Id")

FROM "tbScenics"

GROUP BY  "Scenic_Name", "Scenic_Des", "Scenic_Price", "Scenic_Ticket"

);

3 sql 更新一列为行号

update u_menu

set issort=t1.rowId

from

(

--select * from

--(

select cmenu_id,ROW_NUMBER() over(Order by cmenu_id) as rowId

from u_menu

) as t1

where t1.cmenu_id=u_menu.cmenu_id

--) as t

4 PostgreSQL修改字段ID自增长

CREATE SEQUENCE id_seq START WITH 5;

ALTER TABLE guarantee_contract_open_status ALTER COLUMN id SET DEFAULT nextval('id_seq'::regclass);