选择最大发票号码的问题。用SQL查询... [英] problem with select maximum invoice no. with SQL query...

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问题描述

当我运行此查询时: -

从BillDetails中选择max(BillNo),左边(BillNo,6)='13-14 /'



它只返回'13 -14/9'但我有账单 - 没有'13 -14/10'(这是最大值)..



我的账单没有这样的模式: -

'13 -14/1'

'13 -14/2'

'13 -14/3'

.....

'13 -14/10'

如何获得最高账单没有相同年份('13 -14 /')????

我正在使用MSAccess作为数据库..



感谢高级..



问候:

Jayanta ..

解决方案

< blockquote>尝试:

  SELECT   TOP   1  BillNo  FROM  BillDetails  WHERE  BillNo  LIKE  '  13-14 /%'  ORDER   BY  CAST(SUBSTRING(BillNo) , 7  999  AS   INT 


您正在尝试根据解析字符串获取最大帐单编号。

结果,你不会得到确切的值,因为1和10在字符串中的比较不同。



您可以解析账单否如上所述,然后将该数字转换为整数以获得最大值。


When i run this query :-

select max(BillNo) from BillDetails where left(BillNo,6)='13-14/'


It's return only '13-14/9' but I have bill-no this '13-14/10'(which is maximum)..

My Bill No pattern like :-
'13-14/1'
'13-14/2'
'13-14/3'
.....
'13-14/10'
How to get maximum bill no of a same years('13-14/')????
I'm Using MSAccess as a Database..

Thanks in Advanced..

Regards:
Jayanta..

解决方案

Try:

SELECT TOP 1 BillNo FROM BillDetails WHERE  BillNo LIKE '13-14/%' ORDER BY CAST(SUBSTRING(BillNo, 7, 999) AS INT)


You are trying to get the maximum bill number based on parsing a string.
As a result, you wont get the exact value since 1 and 10 are compared differently in string.

You could parse the bill no as above and then convert that number to integer to get the maximum value.


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