Sql 有效内部联接请求中缺少from子句

我有这个：

SELECT tbl1.* as tbl1 from table1
inner join table2 as tbl2
on tbl1.id = tbl2.table1_id
where tbl2.something = xxx;

为什么会抛出异常

ERROR:  missing FROM-clause entry for table "tbl1"
LINE 3: on tbl1.id = tbl2.table1_id
           ^

---

在第一行中，您将表1中的

作为tbl1

和

按错误的顺序排列

应该是：

select  tbl1.*
from    table1 as tbl1
inner join table2 as tbl2
on      tbl1.id = tbl2.table1_id
where   tbl2.something = xxx;

在第一行中，您将表1中的
作为tbl1
和
按错误的顺序排列

应该是：

select  tbl1.*
from    table1 as tbl1
inner join table2 as tbl2
on      tbl1.id = tbl2.table1_id
where   tbl2.something = xxx;