多表删除

Question

如何正确执行以下DELETE语句，影响多个表：

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

Answer 1

如果表之间存在某种链接，则可以在两个表之间执行连接。否则，如果没有链接，我只会使用两个单独的SQL查询。

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

Answer 2

这样的东西，但你需要指定JOIN条件

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