sql - 使用 SQL 过程循环遍历行

Question

我有两个看起来像这样的表：

Table1(ID, name, street, houseNo, DeliveryID)和Table2(ID, name street houseNo, DeliveryID)

我想创建一个检查 Table1(name, street, houseNo) 和 Table2(name, street houseNo) 内容的过程。如果内容彼此相等，则应将 Table1.DeliveryID 插入 Table2.DelvieryID。

我该怎么做？

Answer 1

请尝试使用内部联接更新（带有内部联接的 SQL Server 更新）：

UPDATE Table2
SET Table2.DelvieryID = Table1.DelvieryID
FROM Table2, Table1
WHERE 
    Table2.name = Table1.name AND
    Table2.street = Table1.street AND
    Table2.houseNo = Table1.houseNo 

要考虑 NULL 值，请尝试

UPDATE Table2
SET Table2.DelvieryID = Table1.DelvieryID
FROM Table2, Table1
WHERE 
    ISNULL(Table2.name, '') = ISNULL(Table1.name, '') AND
    ISNULL(Table2.street, '') = ISNULL(Table1.street, '') AND
    ISNULL(Table2.houseNo, '') = ISNULL(Table1.houseNo, '') 

Answer 2

UPDATE Table2
SET Table2.DelvieryID = Table1.DelvieryID
FROM Table1 t1, Table2 t2
WHERE CHECKSUM(t1.name,t1.street,t1.houseNo)=CHECKSUM(t2.name,t2.street,t2.houseNo)

Answer 3

简单的连接将起作用..

UPDATE tab2
SET tab2.DelvieryID = tab1.DelvieryID
FROM Table2 tab2, Table1 tab1
WHERE 
tab2.name = tab1.name AND
tab2.street = tab1.street AND
tab2.houseNo = tab1.houseNo