怎样写SQL在以下情况下

Question

有两种表，还有两个列是他们

之间

table1: 
id, date 

table2: 
id, date 

同样的问题是，如何更新表2的ID，可以匹配的日期2表，这意味着，例如

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

感谢

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.