Question

我的公司表格为dbo.companies，并且companyId为列。我还有一个dbo.invoices的发票表，其中invoicecompanyId列（与另一个表中的companyId相同），并且还有一个名为invoicedate的列。我想要实现的是每个companyid的视图，以及我所有公司的相应最新发票日期。

我已完成以下操作，但我不知道如何过滤最新发票，它会返回所有公司的所有发票，我需要所有公司的最新发票

SELECT     TOP (100) PERCENT 
    'A' + 
    SUBSTRING('000000', 1, 6 - LEN(CAST(dbo.companies.companyId AS varchar(10)))) +
    CAST(dbo.companies.companyId AS varchar(10)) AS Client_ID, 
    dbo.invoices.invoiceDate AS S_Inv_Date
FROM dbo.invoices 
INNER JOIN dbo.companies 
ON dbo.invoices.invoiceCompanyId = dbo.companies.companyId
ORDER BY Client_ID

你能帮帮忙吗？

TA

Answer 1

SELECT 
       SUBSTRING('000000', 1, 6 - LEN(CAST(dbo.companies.companyId AS varchar(10)))) +
           CAST(dbo.companies.companyId AS varchar(10)) AS Client_ID
     , b.mxDate maxInvoiceDate
  FROM dbo.companies c
     , (SELECT dbo.invoices.invoiceCompanyId companyId
             , MAX(dbo.invoices.invoiceDate) mxDate
          FROM dbo.invoices
        GROUP BY dbo.invoices.invoiceCompanyId ) b
 WHERE c.companyId = b.companyId
 ORDER BY 1

Answer 2

您可以order by S_Inv_Date descending获得所需的结果吗？

Answer 3

我会使用GROUP BY和MAX。快速＆amp;肮脏的样本：

SELECT cy.companyId, cy.CompanyName, max(inv.invoiceDate) as LastInv 
FROM companies as cy, invoices as inv
GROUP BY cy.companyId, cy.CompanyName
WHERE cy.companyId = inv.companyId

我需要在sql中查看一个视图，该视图返回每个公司的最新发票日期

3 个答案: