Oracle更新根據選擇加入

Question

使用以下選擇並希望進行更新，但發現語法有點混亂，在Microsoft SQL中更容易！

select是下面的，我想要做的是根據這個選擇c.allow_to_trade ='Y'到'N'以及其餘條件的任何東西。

SELECT MAX(Trade_date) "TRADE DATE", 
    t.client, 
    c.shortened_name, 
    c.allow_to_trade "ACTIVE", 
    C.GCD_NUMBER 
FROM lib.trades t , 
    lib.client_address c 
WHERE t.client  = c.client 
AND c.allow_to_trade = 'Y' 
GROUP BY C.GCD_NUMBER, 
    t.client, 
    c.shortened_name, 
    c.allow_to_trade 
HAVING MAX(trade_date) < '01-may-2012' 

在此先感謝

Answer 1

能，你，請試試這個：

UPDATE lib.client_address 
SET allow_to_trade='N' 
WHERE client IN 
    (SELECT t.client 
    FROM lib.trades t , 
    lib.client_address c 
    WHERE t.client  = c.client 
    AND c.allow_to_trade = 'Y' 
    GROUP BY C.GCD_NUMBER, 
    t.client, 
    c.shortened_name, 
    c.allow_to_trade 
    HAVING MAX(trade_date) < '01-may-2012' 
);