我怎麼能從表中找到缺失值？

Question

我有這樣

中值的N個NUM
一個表有這樣我怎麼能找到失蹤相同的格式ExciseInvoiceNo，鑑於

DECLARE @temp table 
(val int) 
insert INTO @temp([val]) 
SELECT CONVERT(INT, (case when CHARINDEX('/', EXCISEINVOICENO) > 0 Then 
       cast(substring(EXCISEINVOICENO,1,len(EXCISEINVOICENO) - 3) as int) 
      else Cast(EXCISEINVOICENO as Int) end) ) as ExciseInvoiceIndex 
FROM tblExciseInvoice 
WHERE  CompYearID=109 
    AND (InvoiceDate BETWEEN '10/1/2015 12:00:00 AM' AND '03/30/2016 11:59:59 PM') 
select (select isnull(max(val)+1,1) from @temp where val < md.val) as [from], 
    md.val - 1 as [to] 
from @temp md 
    where md.val != 1 and not exists (
     select 1 from @temp md2 where md2.val = md.val - 1) 

我試圖這一點，但在適當的沒有得到結果Formate

Answer 1

假設您錯過了從發票的第一次發生到最大發票發生的意思。缺失的是之間的任何...

也許你的發票開始在1/15或somethign，然後我們需要LPAD零4個職位。或包含很多可以上去......

Working SQL FIDDLE

這裏有一個方法

1. 將表與自身
2. 但使用加入的+1標準上的左部發票號碼
3. 並確保正確的零件匹配。

這種方法vs超前/滯後窗函數的缺點是它不能使用索引，因爲我們正在操縱字符串，因此它可能在大型數據集上很慢。 。

SELECT A.ExciseInvoiceNO, B.ExciseInvoiceNo, 
case when B.ExciseInvoiceNo is null then 
cast(left(A.ExciseInvoiceNO,4)+1 as varchar(20)) + right(A.ExciseInvoiceNO,3) end 
as MissingInvoices 
FROM foo A 
LEFT JOIN Foo B 
on Left(A.ExciseInvoiceNO,4)+1 = left(B.ExciseInvoiceNO,4) 
and right(A.ExciseInvoiceNO,3) = right(B.ExciseInvoiceNO,3) 
WHERE case when B.ExciseInvoiceNo is null then 
cast(left(A.ExciseInvoiceNO,4)+1 as varchar(20)) + right(A.ExciseInvoiceNO,3) end is not null 

使用

的做法窗口功能

2nd Working Fiddle

這個窗口功能讓你看看通過exciseInvoiceNo訂購的下一個記錄，然後比較結果。我們可能必須先將右邊的3個字符再分配給左邊，但是卻不理解您的InvoiceNumber格式的性質，我不能確定。我使用CTE（公用表表達式）將下一個記錄發票號碼的值存儲在一個數據集中，然後我們使用字符串操作。

with cte as (
Select ExciseInvoiceNO Ino, 
Lead(ExciseInvoiceNo,1) over (order by ExciseInvoiceNo) compare 
from foo A) 

Select case when left(INo,4)+1 = left(compare,4) 
      and right(Ino,3) = right(compare,3) 
     then Null 
     else cast(left(INo,4)+1 as varchar(20)) + right(Compare,3) 
     end as MissingInvoiceNo 
from cte 
WHERE case when left(INo,4)+1 = left(compare,4) 
      and right(Ino,3) = right(compare,3) 
     then Null 
     else cast(left(INo,4)+1 as varchar(20)) + right(Compare,3) end 
    is not null