基于子选择结果的T-sql更新值

MS SQL 2008正在使用，需要存储过程

所以在我的表中，我有一些行，其中IsDouble值是2。 现在，如果字符串的计数（由4列串联而成）大于1，并且字符串的计数为1到0，我需要从第一个select开始将每行的IsDouble从2更新为1

到目前为止，我有这个，但它很可能是不正确的：

select * from TestInvoiceData where Isdouble='2';
update TestInvoiceData
set testinvoicedata.Isdouble=
case 
    when  
    (
        select COUNT (InvoiceDate+InvoiceNumber+VendorCode+Invoicetype) 
        from      TestInvoiceData
     ) >1 then 1
     else 0
end;

编辑

以下是示例数据（invoicetype、invoicenumber、invoicedate、vendorcode）：

根据这个例子，第一行应该在更新1之后，第三行应该是0

update TestInvoiceData set

Isdouble=CASE 
            WHEN (select count(*) from TestInvoiceData as Tid
                  where 
                  tId.InvoiceDate=InvoiceDate
                  AND
                  tId.InvoiceNumber=InvoiceNumber
                  AND
                  tId.VendorCode=VendorCode
                  AND
                  tId.Invoicetype =Invoicetype 
                 ) > 1
                 THEN 1
                 ELSE 0
             END

where Isdouble=2

查询：

UPDATE TestInvoiceData
SET Isdouble = (
SELECT   CASE WHEN count(*)>1 THEN 1
         ELSE 0 END AS cnt
FROM TestInvoiceData t1
  WHERE t1.invoicetype =TestInvoiceData.invoicetype 
  AND   t1.invoicenumber = TestInvoiceData.invoicenumber
  AND   t1.invoicedate = TestInvoiceData.invoicedate
  AND   t1.vendorcode = TestInvoiceData.vendorcode
GROUP BY t1.invoicetype,
         t1.invoicenumber,
         t1.invoicedate,
         t1.vendorcode)
WHERE Isdouble = '2'

结果:

| INVOICETYPE | INVOICENUMBER |                  INVOICEDATE | VENDORCODE | ISDOUBLE |
--------------------------------------------------------------------------------------
|        INVO |    322760-262 |   May, 10 2012 00:00:00+0000 |      81964 |        1 |
|        INVO |    322760-262 |   May, 10 2012 00:00:00+0000 |      81964 |        0 |
|        INVO |    322756-262 |   May, 10 2012 00:00:00+0000 |      81964 |        0 |
|        INVO |    7011200072 |   May, 10 2012 00:00:00+0000 |      46172 |        0 |
|        INVO |    7011200071 |   May, 10 2012 00:00:00+0000 |      46172 |        0 |
|        INVO |    7011200070 |   May, 10 2012 00:00:00+0000 |      46172 |        0 |
|        INVO |    7011200069 |   May, 10 2012 00:00:00+0000 |      46172 |        0 |
|        INVO |    7011200068 |   May, 10 2012 00:00:00+0000 |      46172 |        0 |
|        INVO |      12106563 | April, 24 2012 00:00:00+0000 |      10171 |        0 |
|        INVO |         06649 | April, 24 2012 00:00:00+0000 |      67987 |        0 |

---

您需要提供示例数据。。。有了这样的查询，您将命名一个列

Isdouble

，它不是

bool/bit

？它不是bool/bit，它是nchar，我将添加示例数据您可以在update语句中使用

WHERE

，示例数据如下：

| INVOICETYPE | INVOICENUMBER |                  INVOICEDATE | VENDORCODE | ISDOUBLE |
--------------------------------------------------------------------------------------
|        INVO |    322760-262 |   May, 10 2012 00:00:00+0000 |      81964 |        1 |
|        INVO |    322760-262 |   May, 10 2012 00:00:00+0000 |      81964 |        0 |
|        INVO |    322756-262 |   May, 10 2012 00:00:00+0000 |      81964 |        0 |
|        INVO |    7011200072 |   May, 10 2012 00:00:00+0000 |      46172 |        0 |
|        INVO |    7011200071 |   May, 10 2012 00:00:00+0000 |      46172 |        0 |
|        INVO |    7011200070 |   May, 10 2012 00:00:00+0000 |      46172 |        0 |
|        INVO |    7011200069 |   May, 10 2012 00:00:00+0000 |      46172 |        0 |
|        INVO |    7011200068 |   May, 10 2012 00:00:00+0000 |      46172 |        0 |
|        INVO |      12106563 | April, 24 2012 00:00:00+0000 |      10171 |        0 |
|        INVO |         06649 | April, 24 2012 00:00:00+0000 |      67987 |        0 |