两个查询之间有哪些区别?
SELECT CountryMaster.Id
FROM Districts INNER JOIN
CountryMaster ON Districts.CountryId = CountryMaster.Id
SELECT CountryMaster.Id
FROM CountryMaster INNER JOIN
Districts ON Districts.CountryId = CountryMaster.Id
我知道输出结果会一样,但是如果我忽略复杂查询或拥有数十万行数据(如成百上千个行),表格和列的位置是否会有任何剧烈影响?