Sql 如何获取最大序列号?
这是我上一篇文章的延续: 我有一个疑问:Sql 如何获取最大序列号?,sql,db2,dense-rank,Sql,Db2,Dense Rank,这是我上一篇文章的延续: 我有一个疑问: SELECT INVOICE_NUMBER, INVOICE_SEQ_NUMBER, FILE_NUMBER FROM (SELECT A.INVOICE_NUMBER, A.INVOICE_SEQ_NUMBER, B.FILE_NUMBER, DENSE_RANK() OVER (ORDER BY A.INVOICE_NUMBER) as seqnum FROM TABLE1 A JOIN T
SELECT INVOICE_NUMBER, INVOICE_SEQ_NUMBER, FILE_NUMBER
FROM (SELECT A.INVOICE_NUMBER, A.INVOICE_SEQ_NUMBER, B.FILE_NUMBER,
DENSE_RANK() OVER (ORDER BY A.INVOICE_NUMBER) as seqnum
FROM TABLE1 A JOIN
TABLE2 B
ON A.INVOICE_NUMBER = B.INVOICE_NUMBER AND
A.INVOICE_SEQ_NUMBER = B.INVOICE_SEQ_NUMBER
) t
WHERE seqnum <= 3;
因此,新的要求是如何获得相同发票编号的最大发票序列号?结果应该是这样的:
------------------------------------------------------------------------
| INVOICE_NUMBER | INVOICE_SEQ_NUMBER | FILE_NUMBER |MAX_INV_SEQ_NUMBER|
------------------------------------------------------------------------
|1111111111-1 | 1 | P4324324525 | 4 |
------------------------------------------------------------------------
|1111111111-1 | 2 | P4565674574 | 4 |
------------------------------------------------------------------------
|1111111111-1 | 3 | V4324552557 | 4 |
------------------------------------------------------------------------
|1111111111-1 | 4 | V4324552525 | 4 |
------------------------------------------------------------------------
|2222222222-2 | 1 | S4563636574 | 1 |
------------------------------------------------------------------------
|3333333333-3 | 1 | Q4324325675 | 2 |
------------------------------------------------------------------------
|3333333333-3 | 2 | Q4565674574 | 2 |
------------------------------------------------------------------------
在选择部分中添加一个额外的列,如下所示-
SELECT
INVOICE_NUMBER,
INVOICE_SEQ_NUMBER,
FILE_NUMBER,
(
SELECT COUNT(*)
FROM TABLE1 A
JOIN TABLE2 B
ON A.INVOICE_NUMBER = B.INVOICE_NUMBER
AND A.INVOICE_SEQ_NUMBER = B.INVOICE_SEQ_NUMBER
AND A.INVOICE_NUMBER = t.INVOICE_NUMBER
)MAX_INV_SEQ_NUMBER
FROM ........
将以下表达式添加到
选择列表中:
,最大值(发票序号)超过(按发票序号划分)作为最大发票序号
SELECT
INVOICE_NUMBER,
INVOICE_SEQ_NUMBER,
FILE_NUMBER,
(
SELECT COUNT(*)
FROM TABLE1 A
JOIN TABLE2 B
ON A.INVOICE_NUMBER = B.INVOICE_NUMBER
AND A.INVOICE_SEQ_NUMBER = B.INVOICE_SEQ_NUMBER
AND A.INVOICE_NUMBER = t.INVOICE_NUMBER
)MAX_INV_SEQ_NUMBER
FROM ........
SELECT INVOICE_NUMBER, INVOICE_SEQ_NUMBER, FILE_NUMBER, MAX(INVOICE_SEQ_NUMBER) OVER (PARTITION BY INVOICE_NUMBER)
FROM (SELECT A.INVOICE_NUMBER, A.INVOICE_SEQ_NUMBER, B.FILE_NUMBER,
DENSE_RANK() OVER (ORDER BY A.INVOICE_NUMBER) as seqnum
FROM TABLE1 A JOIN
TABLE2 B
ON A.INVOICE_NUMBER = B.INVOICE_NUMBER AND
A.INVOICE_SEQ_NUMBER = B.INVOICE_SEQ_NUMBER
) t
WHERE seqnum <= 3;
MAX(INVOICE_SEQ_NUMBER) OVER (PARTITION BY INVOICE_NUMBER)