Au sein de la connexion MySQL Query

Les données de test:
les fournisseurs

CREATE TABLE suppliers(
s_id INT NOT NULL AUTO_INCREMENT,
s_name CHAR(50) NOT NULL,
s_city CHAR(10) NULL,
s_zip CHAR(10) NULL,
s_call CHAR(50) NOT NULL,
PRIMARY KEY(s_id)
);
INSERT INTO suppliers(s_id, s_name,s_city,  s_zip, s_call)
VALUES(101,'FastFruit Inc.','Tianjin','300000','48075'),
(NULL,'LT Supplies','Chongqing','400000','44333'),
(NULL,'ACME','Shanghai','200000','90046'),
(NULL,'FNK Inc.','Zhongshan','528437','11111'),
(NULL,'Good Set','Taiyuang','030000', '22222'),
(NULL,'Just Eat Ours','Beijing','010', '45678'),
(NULL,'DK Inc.','Zhengzhou','450000', '33332');

des fruits

CREATE TABLE fruits
(
f_id    char(10)     	NOT NULL,
s_id    INT        	NOT NULL,
f_name  char(255)  	NOT NULL,
f_price decimal(8,2)  	NOT NULL,
PRIMARY KEY(f_id) 
); 
 
 
 INSERT INTO fruits (f_id, s_id, f_name, f_price)
     VALUES('a1', 101,'apple',5.2),
     ('b1',101,'blackberry', 10.2),
     ('bs1',102,'orange', 11.2),
     ('bs2',105,'melon',8.2),
     ('t1',102,'banana', 10.3),
     ('t2',102,'grape', 5.3),
     ('o2',103,'coconut', 9.2),
     ('c0',101,'cherry', 3.2),
     ('a2',103, 'apricot',2.2),
     ('l2',104,'lemon', 6.4),
     ('b2',104,'berry', 7.6),
     ('m1',106,'mango', 15.6),
     ('m2',105,'xbabay', 2.6),
     ('t4',107,'xbababa', 3.6),
     ('m3',105,'xxtt', 11.6),
     ('b5',107,'xxxx', 3.6);

Tableau Structure:
Fruit

f_id      s_id  f_name      f_price  
------  ------  ----------  ---------
a1         101  apple       5.20     
a2         103  apricot     2.20     
b1         101  blackberry  10.20    
b2         104  berry       7.60     
b5         107  xxxx        3.60     
bs1        102  orange      11.20    
bs2        105  melon       8.20     
c0         101  cherry      3.20     
l2         104  lemon       6.40     
m1         106  mango       15.60    
m2         105  xbabay      2.60     
m3         105  xxtt        11.60    
o2         103  coconut     9.20     
t1         102  banana      10.30    
t2         102  grape       5.30     
t4         107  xbababa     3.60     

Fournisseurs

  s_id  s_name          s_city     s_zip   s_call  
------  --------------  ---------  ------  --------
   101  FastFruit Inc.  Tianjin    300000  48075   
   102  LT Supplies     Chongqing  400000  44333   
   103  ACME            Shanghai   200000  90046   
   104  FNK Inc.        Zhongshan  528437  11111   
   105  Good Set        Taiyuang   030000  22222   
   106  Just Eat Ours   Beijing    010     45678   
   107  DK Inc.         Zhengzhou  450000  33332  

• Jointure interne requête

SELECT suppliers.`s_id`,s_name,f_name,f_price
FROM fruits,suppliers
WHERE fruits.`s_id`=suppliers.`s_id`;

Tableau comme les fruits et les fournisseurs Tableau S_ID ont le même domaine, donc quand la comparaison, les besoins de table pour nom complet (le format « nom de la table, le nom de la colonne »), est donnée que si le S_ID, MySQL ne sait qui fait référence à un, et renvoie un message d'erreur.

- jointure interne

SELECT suppliers.`s_id`,s_name,f_name,f_price
FROM fruits inner join suppliers
on fruits.`s_id`=suppliers.`s_id`;

Requête alimentation F_ID = « A1 » types fournis fruits du nom du vendeur de fruits et de fruits

select f.`f_name`,s.`s_name` 
from fruits as f inner join suppliers as s on f.`s_id`=s.`s_id` 
where f.`s_id`=(select s_id from fruits as f where f.`f_id`='a1')；

jointure interne sur XXXX XXXX XXXX

- autojointure
requête alimentation F_ID = « a1 » du type fourni par Fruit

select  f.`f_name` from fruits as f , fruits as r  
where f.`s_id`=r.s_id and r.f_id='a1';

Remarque: sélectionnez la sous-requête

SELECT f.`f_name`
 FROM fruits AS f  
 WHERE f.`s_id`=(SELECT s_id FROM fruits AS f WHERE f.`f_id`='a1')