Question

我有一个包含表myTable和列id, NameID, InvoiceNo, BilleeNo, Date的MySQL数据库。行数不断变化（可能会增加或减少）。

myTable的：

id    NameID   InvoiceNo    BilleeNo    Date
1     N01      4566         02          01-MAR-2013
2     N01      unallocated  02          01-MAR-2013
3     N02      1233         02          01-MAR-2013
4     N02      1233         02          01-MAR-2013
5     N02      unallocated  02          01-MAR-2013
6     N02      1244         02          01-JUN-2013

我想更新未分配的InvoiceNo，InvoiceNo具有相同的NameID, BilleeNo和Date。

更新后的表格为：

id    NameID   InvoiceNo    BilleeNo    Date
1     N01      4566         02          01-MAR-2013
2     N01      4566         02          01-MAR-2013
3     N02      1233         02          01-MAR-2013
4     N02      1233         02          01-MAR-2013
5     N02      1233         02          01-MAR-2013
6     N02      1244         02          01-JUN-2013

我尝试了这个查询：

UPDATE np as updated_np 
SET invoice_no = old_np.invoice_no 
FROM np as old_np 
WHERE old_np.nameid = updated_np.nameid and 
      old_np.date = updated_np.date and 
      old_np.BILLEE_NO = updated_np.BILLEE_NO and 
      old_np.invoice_no != 'unallocated' and
      updated_np.invoice_no='unallocated';

Answer 1

您可以使用NameID（+其他列）在同一个表上加入，并在join子句中指定仅加入已经分配了InvoiceNo的数据集。

UPDATE myTable
INNER JOIN myTable AS upd 
    ON upd.NameID = myTable.NameID 
    AND upd.BilleeNo = myTable.BilleeNo 
    AND upd.Date = myTable.Date 
    AND upd.InvoiceNo != "unallocated"
SET 
    myTable.InvoiceNo = upd.InvoiceNo
WHERE 
    myTable.InvoiceNo = "unallocated"

Answer 2

试试这个

update mytable set InvoiceNo='1233' where id in (select tb1.id from mytable tb1, mytable tb2 where tb1.InvoiceNumber='unallocated' and tb1.NameId=tb2.NameId and tb1.BilleNo=tb2.BilleNo and tb1.Date=tb2.Date)

在单个SQL中更新具有不同值的多个行

2 个答案: