根据来自不同表的数据从表中删除记录

Question

table1包含列CITY和COUNTRY。 table2有列CITY。

如何从table2中删除所有与table1共有CITY的记录，以及COUNTRY ='Russia'？

请记住，两个表都有大约100万行数据

Answer 1

您可以使用multitable delete syntax：

DELETE table2
FROM table1
JOIN table2
ON table1.city = table2.city
WHERE table1.country = 'RUSSIA'

Answer 2

DELETE table2
FROM table2 INNER JOIN table1
   ON table2.CITY = table1.CITY
WHERE table1.COUNTRY = 'Russia'