怎樣寫SQL在以下情況下

Question

有兩種表，還有兩個列是他們

之間

table1: 
id, date 

table2: 
id, date 

同樣的問題是，如何更新表2的ID，可以匹配的日期2表，這意味着，例如

update table2 set table2.id = table1.id Where table1.date = table2.date 

感謝

Answer 1

update t2 set t2.id = t1.id 
from table2 t2 
inner join table1 t1 on t1.date = t2.date 

Edit

update t2 set t2.id = t1.id 
from table2 t2 
inner join table1 t1 on t1.date = t2.date 
where convert(date,t2.date)>'2013/01/01' --YYYY/MM/DD if your Date column is datetime.