Question

我有一个表中的客户列表，我想为每个客户分配一个序列号并将其保存到另一个表中。但是，序列应该每个月重新开始。

目前，我有这个问题：

INSERT INTO tblSerialNo
SELECT CustomerNo
      ,FORMAT(getdate(), 'yyyyMM')
      ,ROW_NUMBER() OVER (ORDER BY CustomerNo ASC) AS SerialNo 
FROM tblCustomer

但是，即使月份发生了变化，SerialNo列上的序列仍在继续。

当前输出：

--------------------------
|Customer|Month |SerialNo|
|--------+------+--------|
|17000001|201710|00001   |
|17000002|201710|00002   |
|17000003|201710|00003   |
|17000004|201710|00004   |
|17000005|201710|00005   |
|17000001|201710|00006   |
|17000002|201710|00007   |
|17000003|201710|00008   |
|17000004|201710|00009   |
|17000005|201710|00010   |
|17000001|201711|00011   |
|17000002|201711|00012   |
|17000003|201711|00013   |
|17000004|201711|00014   |
|17000005|201711|00015   |
--------------------------

期望的输出：

--------------------------
|Customer|Month |SerialNo|
|--------+------+--------|
|17000001|201710|00001   |
|17000002|201710|00002   |
|17000003|201710|00003   |
|17000004|201710|00004   |
|17000005|201710|00005   |
|17000001|201710|00006   |
|17000002|201710|00007   |
|17000003|201710|00008   |
|17000004|201710|00009   |
|17000005|201710|00010   |
|17000001|201711|00001   |
|17000002|201711|00002   |
|17000003|201711|00003   |
|17000004|201711|00004   |
|17000005|201711|00005   |
--------------------------

请帮忙。提前谢谢。

Answer 1

在PARTITION BY子句之前添加ORDER BY：

INSERT INTO tblSerialNo
SELECT CustomerNo
      ,FORMAT(getdate(), 'yyyyMM')
      ,ROW_NUMBER() OVER (PARTITION BY FORMAT(getdate(), 'yyyyMM') ORDER BY CustomerNo ASC) AS SerialNo 
FROM tblCustomer

Answer 2

你可以做这样的事情

INSERT INTO tblSerialNo
select customerno,[Month],
ROW_NUMBER() OVER (partition by [Month] ORDER BY CustomerNo ASC) AS SerialNo  from 
(
SELECT CustomerNo ,FORMAT(getdate(), 'yyyyMM')as [Month] FROM tblCustomer
)as a

Answer 3

INSERT INTO tblSerialNo
SELECT CustomerNo
      ,FORMAT(getdate(), 'yyyyMM')
      ,ROW_NUMBER()OVER(Partition By FORMAT(getdate(), 'yyyyMM') Order By CustomerNo ASC)As SerialNo 
FROM tblCustomer

SQL Server条件序列号

3 个答案: