省市區-民族sql

SELECT * from area a LEFT JOIN city c 
ON c.id=a.super
WHERE c.`name` IS NULL

 

 

INSERT INTO area

SELECT * FROM province

union all

SELECT * FROM city

三張表合併

 

SELECT GROUP_CONCAT(p.id) FROM province p
WHERE p.id IN(SELECT id FROM city )

同樣的數據

 

INSERT into area 

SELECT p.* FROM province p  

union all

SELECT c.* FROM city c  WHERE c.id NOT IN(SELECT p.id FROM province p
WHERE p.id IN(SELECT id FROM city ))

 

加type

INSERT into area 
 
SELECT p.* FROM province p  
 
union all
 
SELECT c.* FROM city c