Question

我正在使用ORACLE 8.0。我有一个柱面主机，一个事务日志头文件和一个事务日志尾部（详细信息）。结构如下：

Mcylinder：ID，CSTAGE， TCYLINDERHD：logno，logdate，accode，docref，mmode， Tcylindertl：logno，id

对于日志标题，会有许多日志尾部
对于mcylinder中CSTAGE为4的每个Cylinders，我想从日志文件中获取mmode（与CSTAGE相同）= 4的柱面事务的最新日期的详细信息。

我尝试了几种方法但没有成功。我尝试的最后一个sql如下：

    SELECT cout.ID,tlog.LOGNO,tlog.LOGDATE,tlog.ACCODE,tlog.DOCREF
FROM
(SELECT "ID" FROM "MCYLINDER" WHERE "CSTAGE"=4 ORDER BY "ID") cout,
(SELECT  "LOGNO","LOGDATE","ACCODE","DOCREF" FROM "TCYLINDERHD" WHERE "MMODE" = 4 order by "LOGNO") tlog,
(SELECT  MAX(a."LOGDATE"),b."ID",b."LOGNO" FROM "TCYLINDERHD" a,"TCYLINDERTL" b
  WHERE (a."MMODE" = 4) AND  (a."LOGNO" = b."LOGNO") GROUP BY b."ID" order by b."ID",b."LOGNO") mlog
WHERE (cout.ID=mlog.ID AND mlog.LOGNO=tlog.LOGNO)
order by cout.ID;

SQL显示错误说明缺少paranthesis。我不知道为什么。这也是正确的方法吗？

请帮忙。

提前完成。

Answer 1

首先，删除所有括号，在Oracle中你不需要它们。其次，如果我正确理解了您要实现的目标，请尝试以下查询。如果它没有帮助，请考虑在您的问题中添加样本数据和所需结果，这样可以更轻松地为您提供帮助。

SELECT t1.id, t2.logno, t3.logdate, t3.accode, t3.docref FROM MCYLINDER t1 
       INNER JOIN TCYLINDERTL t2 ON t1.id = t2.id
       INNER JOIN TCYLINDERHD t3 ON t2.logno = t3.logno
WHERE t1.cstage = 4
      AND t3.mmode = 4
      AND t3.logdate >= ALL (SELECT t4.logdate FROM TCYLINDERHD t4 
                                    INNER JOIN TCYLINDERTL t5 ON t4.logno = t5.logno
                             WHERE t5.id = t2.id AND t4.mmode = t3.mmode)

Oracle - 选择最大记录（最新日期）

1 个答案: