Left Join SQL

24:01:2010 г.

, SQL , , "" . , , LEFT JOIN, .

Left Join SQL -

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Microsoft Access, . , SQL SQL Left Join, , , - MySQL, MSSQL .

Cars Drivers. 5 - .

Cars



- 3 . Manufacturer Years . , Id_Driver - 1- 1, - 5. , :

- Honda
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left join SQL , , , , - .

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- Left Join SQL.

SQL  Left Join:

SELECT *
FROM Drivers AS D
LEFT JOIN Cars AS C ON D.ID=C.Id_Driver
WHERE C.Id_Driver is NULL;

:
Left Join , , AS. , , ID, NULL. 
SQL Left Join
SQL , .

:  SQL Left Join , , , WHERE.

P.S: , , , Left Join , . , -, .

SQL :
SELECT *
FROM Drivers AS D
WHERE NOT EXISTS
(SELECT C.Id_Driver FROM Cars AS C WHERE D.ID=C.Id_Driver)

 

  

 
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