SELECT id, strasse, plz FROM adress WHERE NOT EXISTS ( SELECT NULL FROM post_plz WHERE post_plz.street = adress.strasse AND post_plz.plz = adress.plz ) -- ORDER BY {expression} LIMIT 5

没有使用ORDER BY时，查询结果是非确定性的（两次查询可能产生不同的结果）。因此强烈建议添加一些行排序。

索引post_plz (adress, plz)和adress (strasse, plz, id)必须进行优化。

You could try using aleft join between the table and check for not mactching values

SELECT id, strasse, plz from `adress` left join post_plz on strasse = street AND `street` like adress.strasse AND plz like adress.plz WHERE street is null LIMIT 5;

你可以尝试在表之间使用左连接，并检查不匹配的值

SELECT id, strasse, plz from `adress` left join post_plz on strasse = street AND `street` like adress.strasse AND plz like adress.plz WHERE street is null LIMIT 5;