帮我看一下这样的SQL语句等不等价

Question

语句1：
select T1a,T1b,(select T2a from table2 where table2.T2b=table1.T1c ) as T2a from table1

与

语句2：
select T1a,T1b,table2.T2a from table1 inner join table2 on table2.T2b=table1.T1c

等不等价

Answer 1

等价的。。。。。。。