从另一列的可重复值更新列答案

【问题标题】：Updating a column from another's repeatable values从另一列的可重复值更新列
【发布时间】：2010-12-05 18:42:44
【问题描述】：

我有下表

发票

+++++++++++++++++++++++++++
+ InvoiceId + InvoiceDate +
+++++++++++++++++++++++++++
+   int     +     int     +
+++++++++++++++++++++++++++

发票行

++++++++++++++++++++++++++++++++++++++++++++
+ InvoiceLineId +  InvoiceId + InvoiceDate +
++++++++++++++++++++++++++++++++++++++++++++
+    int        +    int     +    int      +
++++++++++++++++++++++++++++++++++++++++++++

我最近将最后一个 (InvoiceDate) 列添加到表中，我想用 Invoice 表中的相应值更新它的值。对于两个表中匹配的每个 InvoiceId，应将 InvoiceDate 添加到 InvoiceLine。

如果需要更多意见，请不要犹豫。

【问题讨论】：

标签： tsql sql-server-2008

【解决方案1】：

Update InvoiceLine
Set InvoiceDate = Invoice.InvoiceDate 
From Invoice inner join InvoiceLine on Invoice.InvoiceId = InvoiceLine.InvoiceId

【讨论】：

【解决方案2】：

也许是这样的？

    update detail
    set invoicedate = summary.invoicedate
    from invoiceline detail 
         inner join invoice summary
             on summary.invoiceid = detail.invoiceid

【讨论】：