選擇無地址的客戶

Question

有兩個表ps_customer和ps_address。

ps_customer contains: id_customer and customer.email 
ps_address contains: id_customer and few other fields. 

我想選擇數據不在ps_address表中的客戶。 我使用SQL查詢：

SELECT id_customer, customer.email FROM ps_customer 
WHERE id_customer NOT IN SELECT id_customer FROM ps_address; 

但它拋出，有什麼不對的查詢SELECT id_customer FROM ps_address

Answer 1

你需要把括號圓你查詢的最後一部分，以表明它是一個子查詢的錯誤：

SELECT id_customer, customer.email FROM ps_customer 
WHERE id_customer NOT IN (SELECT id_customer FROM ps_address); 

Answer 2

您可以使用左側加入了這個東西作爲

select 
c.id_customer, 
c.customer.email 
from ps_customer c 
left join ps_address a on a.id_customer = c.id_customer 
where a.id_customer is null 

Answer 3

您可以嘗試使用左加入

SELECT id_customer, customer.email FROM ps_customer pc left join ps_address pa 
on pc.id_customer = pa.id_customer 
where pa.id_customer is null; 

Answer 4

您可以使用左連接它：

SELECT id_customer, customer.email 
FROM ps_customer 
    left join ps_address on ps_customer.id_customer= ps_address.id_customer 
where ps_address.id_customer is null; 

，或者如果你想使用子查詢，你必須使用()約於子查詢：

SELECT id_customer, customer.email FROM ps_customer 
WHERE id_customer NOT IN (SELECT id_customer FROM ps_address); 

Answer 5

您需要在這兩個表上有一個LEFT OUTER JOIN。

SELECT PSC.id_customer, PSCcustomer.email 
FROM ps_customer PSC 
LEFT OUTER JOIN ps_address PSA on PSC.id_customer = PSA.id_customer 
WHERE PSA.id_customer IS NULL