update second table

I would like to know if table 2 had a price change how would I update table1 or check if there is any updates from table 2 so i may insert into table1.  Do I have to also check the producid's and past this or can i do it from a select.  what would be the correct syntax

If Exists (SELECT ProductID, price from table1 where user=@user)

update table1 set price=price
 where user=@user

Insert into table1
(productid, price)

select productid, price from Table2
Seven priceFull StackAsked:
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UPDATE table1 SET table1.Price = Table2.Price FROM table1 inner join table2 on table1.productid = table2.productid

INSERT INTO table1 (productID,Price) select productID,Price from table2 WHERE productID not in (Select ProductID from table1)

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Microsoft SQL Server 2005

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