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{
CAR_ID INT IDENTITY
CUST_ID INT
}
(T_CUSTOMER)
{
CUST_ID INT IDENTITY
CUST_NAME VARCHAR(100)
}

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SELECT * from T_CAR WHERE CUST_ID NOT IN (SELECT CUST_ID from T_CUSTOMER)
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SELECT * from T_CAR C LEFT JOIN T_CUSTOMER R ON C.CUST_ID=R.CUST_ID WHERE R.CUST_ID IS NULL (ÒÑÖªCUST_IDÔÚ±íT_CARÊÇΨһµÄ¡£)

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select *
from car
left join customer c on car.cust_id=c.cust_id
where c.cust_id is null