产生相同结果的这两种类型的查询之间的差异

Question

我正在使用MYSQL数据库

我能够在两个表上编写连接以获得相同的结果，如下所示

SELECT Cust.name, Cust.customer_id, US.user_type, Cust.mobile_number, US.session_id
FROM uuid_session US, customer Cust 
WHERE Cust.customer_id = US.oms_user_id AND US.uuid='333';


SELECT Cust.name, Cust.customer_id, US.user_type, Cust.mobile_number, US.session_id
FROM uuid_session US INNER JOIN customer Cust ON Cust.customer_id = US.oms_user_id AND US.uuid='333';

当我执行两个查询时产生相同的结果

这是我的sqlfiddle

http://sqlfiddle.com/#!2/3f9635/2

请让我知道为什么有两种语法＆＃39;