鉴于表STATEMENT（下面提供的创建和数据插入命令）中的以下数据，我希望提取字段CUMULATEDAMOUNT的值，以获取STATEMENTNUMBER的最大值，该最大值对应于STATEMENTDATETIME的最大值，用于记录组与ACCOUNTKEY值相同的ACCOUNTKEY值，其中RUNID = 14547。
SQL＆GT; select * from statement order by 2,4;
+------------+----------+---------------+------------------+----------------+------+-----------------+----------+
|STATEMENTKEY|ACCOUNTKEY|CLASSIFICATION | STATEMENTDATETIME|STATEMENTNUMBER |RUNID |CUMULATEDAMOUNT |STATUS |
+------------+----------+---------------+------------------+----------------+------+-----------------+----------+
| 111177| 888881|EndOfDay | 27/11/15 | 199 |14306 | 202,12 |Created |
| 111177| 888881|EndOfDay | 27/11/15 | 192 |14302 | 606,66 |Processed |
| 111155| 888882|EndOfDay | 30/11/15 | 301 |14552 | 303,33 |Processed |
| 111127| 888886|IncIday | 27/11/15 | 198 |14506 | 707,77 |Processed |
| 111118| 888888|EndOfDay | 17/11/15 | 119 |14547 | 808,88 |Processed |
| 111112| 888888|EndOfDay | 19/11/15 | 103 |14500 | 909,99 |Processed |
| 111144| 888888|EndOfDay | 27/11/15 | 204 |14509 | 505,55 |Processed |
| 111183| 888888|EndOfDay | 28/11/15 | 202 |14514 | 404,44 |Processed |
| 111104| 888888|EndOfDay | 29/11/15 | 201 |14513 | 101,11 |Processed |
| 111194| 888888|EndOfDay | 29/11/15 | 239 |14813 | 102,22 |Processed |
+------------+----------+---------------+------------------+----------------+------+-----------------+----------+
10 ligne(s) selectionnee(s).
因此，对于RUNID = 14547，ACCOUNTKEY = 888888，这会产生6条记录
SQL＆GT; select * from statement where ACCOUNTKEY = 888888 order by 2,4;
+------------+----------+-----------------+--------------------+-------------------+------+---------------+---------+
|STATEMENTKEY|ACCOUNTKEY| CLASSIFICATION | STATEMENTDATETIME | STATEMENTNUMBER | RUNID|CUMULATEDAMOUNT|STATUS |
|------------|----------|-----------------|--------------------|-------------------+------+---------------+---------|
| 111118| 888888| EndOfDay | 17/11/15 | 119 | 14547| 808,88 |Processed|
| 111112| 888888| EndOfDay | 27/11/15 | 103 | 14500| 909,99 |Processed|
| 111144| 888888| EndOfDay | 28/11/15 | 204 | 14509| 505,55 |Processed|
| 111183| 888888| EndOfDay | 29/11/15 | 202 | 14514| 404,44 |Processed|
| 111104| 888888| EndOfDay | 29/11/15 | 201 | 14513| 101,11 |Processed|
| 111194| 888888| EndOfDay | 29/11/15 | 239 | 14813| 102,22 |Processed|
+------------+----------+-----------------+--------------------+-------------------+------+---------------+---------+
6 ligne(s) selectionnee(s).
MAX（STATEMENTDATETIME）= 29/11/15，其中MAX（STATEMENTNUMBER）= 239，给出了所需的结果：CUMULATEDAMOUNT = 102,22
我目前的选择如下：
select cumulatedamount from statement STX WHERE STX.statementKey in (
SELECT distinct st2.statementKey FROM statement st2
INNER JOIN
(
SELECT S2.ACCOUNTKEY as ACCOUNTKEY,
S2.CLASSIFICATION as CLASSIFICATION,
S2.STATEMENTDATETIME as STATEMENTDATETIME,
MAX(S2.STATEMENTNUMBER) as STATEMENTNUMBER
FROM
(
SELECT ACCOUNTKEY,
CLASSIFICATION,
MAX(STATEMENTDATETIME) AS STATEMENTDATETIME
FROM STATEMENT st3
WHERE
STATUS in ('Processed', 'Created')
AND EXISTS
(
SELECT stCur.statementKey FROM statement stCur
WHERE stCur.runId=14547
AND stCur.accountKey = st3.accountKey
)
GROUP BY
ACCOUNTKEY, CLASSIFICATION
) S1
INNER JOIN STATEMENT S2 ON S2.ACCOUNTKEY = S1.ACCOUNTKEY
AND
S2.STATEMENTDATETIME=S1.STATEMENTDATETIME
AND
S2.STATUS in ('Processed', 'Created')
AND
S1.CLASSIFICATION =S2.CLASSIFICATION
GROUP BY S2.ACCOUNTKEY,S2.CLASSIFICATION,S2.STATEMENTDATETIME
) v
ON
(
st2.accountKey = v.accountKey
and
st2.classification = v.classification
and
st2.STATEMENTDATETIME=v.STATEMENTDATETIME
and
st2.STATEMENTNUMBER=v.STATEMENTNUMBER
and
st2.status in ('Processed', 'Created')
)
WHERE
st2.accountKey = STX.accountKey
AND
st2.classification = STX.classification ) AND STX.classification in ('EndOfDay','IncIday');
创建表格：
CREATE TABLE STATEMENT
(
STATEMENTLEY NUMBER(38) NOT NULL,
ACCOUNTKEY NUMBER(38),
CLASSIFICATION VARCHAR2(30),
STATEMENTDATETIME DATE NOT NULL ,
STATEMENTNUMBER VARCHAR2(35),
RUNID NUMBER(38),
CUMULATEDAMOUNT NUMBER(38,5),
STATUS VARCHAR2(30)
);
插入数据：
insert into statement (statementkey,accountkey,classification,statementdatetime,statementnumber,runid,cumulatedamount,status)values (111104,888888,'EndOfDay',to_date('29-11-2015 11:00:00','DD-MM-YYYY HH24:MI:SS'),201,14513,101.11,'Processed');
insert into statement (statementkey,accountkey,classification,statementdatetime,statementnumber,runid,cumulatedamount,status)values (111194,888888,'EndOfDay',to_date('29-11-2015 11:00:00','DD-MM-YYYY HH24:MI:SS'),239,14813,102.22,'Processed');
insert into statement (statementkey,accountkey,classification,statementdatetime,statementnumber,runid,cumulatedamount,status)values (111177,888881,'EndOfDay',to_date('27-11-2015 11:00:00','DD-MM-YYYY HH24:MI:SS'),199,14306,202.12,'Created');
insert into statement (statementkey,accountkey,classification,statementdatetime,statementnumber,runid,cumulatedamount,status)values (111155,888882,'EndOfDay',to_date('30-11-2015 11:00:00','DD-MM-YYYY HH24:MI:SS'),301,14552,303.33,'Processed');
insert into statement (statementkey,accountkey,classification,statementdatetime,statementnumber,runid,cumulatedamount,status)values (111183,888888,'EndOfDay',to_date('28-11-2015 11:00:00','DD-MM-YYYY HH24:MI:SS'),202,14514,404.44,'Processed');
insert into statement (statementkey,accountkey,classification,statementdatetime,statementnumber,runid,cumulatedamount,status)values (111144,888888,'EndOfDay',to_date('27-11-2015 11:00:00','DD-MM-YYYY HH24:MI:SS'),204,14509,505.55,'Processed');
insert into statement (statementkey,accountkey,classification,statementdatetime,statementnumber,runid,cumulatedamount,status)values (111177,888881,'EndOfDay',to_date('27-11-2015 11:00:00','DD-MM-YYYY HH24:MI:SS'),192,14302,606.66,'Processed');
insert into statement (statementkey,accountkey,classification,statementdatetime,statementnumber,runid,cumulatedamount,status)values (111127,888886,'IncIday',to_date('27-11-2015 11:00:00','DD-MM-YYYY HH24:MI:SS'),198,14506,707.77,'Processed');
insert into statement (statementkey,accountkey,classification,statementdatetime,statementnumber,runid,cumulatedamount,status)values (111118,888888,'EndOfDay',to_date('17-11-2015 11:00:00','DD-MM-YYYY HH24:MI:SS'),119,14547,808.88,'Processed');
insert into statement (statementkey,accountkey,classification,statementdatetime,statementnumber,runid,cumulatedamount,status)values (111112,888888,'EndOfDay',to_date('19-11-2015 11:00:00','DD-MM-YYYY HH24:MI:SS'),103,14500,909.99,'Processed');
commit;
我想通过使用分析函数简化上面的SELECT，非常感谢任何帮助。
答案 0 :(得分：2)
SELECT *
FROM (SELECT *
FROM STATEMENT
WHERE ACCOUNTKEY = (SELECT ACCOUNTKEY FROM STATEMENT WHERE RUNID = 14547)
ORDER BY STATEMENTDATETIME DESC, STATEMENTNUMBER DESC
)
WHERE ROWNUM = 1
或使用分析函数而不是rownum：
SELECT *
FROM (SELECT s.*
,row_number() OVER(ORDER BY STATEMENTDATETIME DESC, STATEMENTNUMBER DESC) rn
FROM STATEMENT s
WHERE ACCOUNTKEY = (SELECT ACCOUNTKEY FROM STATEMENT WHERE RUNID = 14547)
)
WHERE rn = 1
将*替换为CUMULATEDAMOUNT。
并相应地添加其他过滤条件STATUS in ('Processed', 'Created') ...
答案 1 :(得分：1)
请使用RANK() OVER (PARTITION BY .. ORDER BY ..)
SELECT CUMULATEDAMOUNT
FROM (
SELECT CUMULATEDAMOUNT
, RANK() OVER (ORDER BY STATEMENTDATETIME DESC, STATEMENTNUMBER DESC) RNK
FROM (
SELECT *
FROM STATEMENT
WHERE ACCOUNTKEY IN (
SELECT ACCOUNTKEY
FROM STATEMENT
WHERE RUNID = 14547
)
)
) WHERE RNK = 1