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UPDATE Customer C SET name = B.name, age = B.age FROM (SELECT A.*, B.* FROM CUSTOMER_TEMP WHERE A.ID = B.ID) AS B

I got a sql as above, after I run the query, it update all my rows to the same result.

I wonder I need a where after 

UPDATE Customer C SET name = B.name, age = B.age FROM (SELECT A.*, B.* FROM CUSTOMER_TEMP WHERE A.ID = B.ID) AS D WHERE C.ID = D.ID

But i got this id is ambiguous for the last query.

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Try this

update Customer set name = B.name, age = B.age from Customer as C inner join CUSTOMER_TEMP as B on B.ID = C.ID

SQL FIDDLE EXAMPLE

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