MULT-表中刪除

Question

我將如何正確地做了以下DELETE聲明，影響多個表：

DELETE FROM exchange_rates, raw_financials WHERE date='2011-12-01' 

Answer 1

如果有某些表之間的鏈接，那麼你可以在兩個表之間執行連接。否則，如果沒有鏈接，我只會使用兩個單獨的SQL查詢。

DELETE FROM exchange_rates WHERE date='2011-12-01' 
DELETE FROM raw_financials WHERE date='2011-12-01' 

Answer 2

這樣的事情，但你需要指定JOIN條件

DELETE FROM exchange_rates er, raw_financials rf 
USING (the joining column(s) here) 
WHERE er.date = '2011-12-01'