在內部聯接查詢中需要幫助

Question

SELECT table1.*,table2.*, table3.* 
FROM table1, table2, table3 
inner join 
(
    select table1.id AS pid, max(table1.createtime) AS timestamp 
    from table1 group by table1.id 
) A on A.pid = table1.id AND A.timestamp = table1.createtime 
WHERE table3.id = table1.id 
ORDER BY table1.createtime; 

我想只抓取table1中每個id的最後修改記錄。

對於我得到的錯誤作爲上述查詢：

"%s:invalid identifier" for "A.timestamp = table1.IDA2A2" this part. 

請讓我知道什麼是錯的這個查詢。 DB是Oracle。

Answer 1

您的問題的一部分是混合JOIN語法 - 您的查詢使用逗號連接和ANSI JOIN語法。您需要正確加入表格：

SELECT t1.,t2., t3.* 
FROM table1 t1 
INNER JOIN table2 t2 
    on t1.id = t2.id 
INNER JOIN table3 t3 
    on t1.id = t3.id 
inner join 
(
    select table1.id AS pid, max(table1.createtime) AS timestamp 
    from table1 
    group by table1.id 
) A 
    on A.pid = t1.id 
    AND A.timestamp = t1.createtime 
ORDER BY t1.createtime;