Question

我有两张表，如下所示：

表1（ID，名称，街道，houseNo，DeliveryID）和表2（ID，名称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（SQL Server Update with Inner Join）：

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

使用SQL过程循环遍历行

3 个答案: