SQL：如果在另一個表中找不到ID（使用單個查詢）

Question

我在MySQL服務器上有兩個表：T1和T2。 ID是我的主鍵，而ID是T2的外鍵。如果我知道與它們（值）相關的ID，但只有在T1中沒有找到這個ID的情況下，我如何在T2中插入一些值（使用單個查詢）？

T1 
id,c1,c2,c3,many other columns 
example id:'fry54632' //yes, it is not numerical if matters 

T2 
id,cc1,cc2,cc3,few other columns 
example id:'fry54632', cc1,cc2,cc3... have nothing in common with c1,c2,c3 

myDataSource: 
countains id, which is same for T1 and T2 and contains some other data that should be 
inserted in T2 but not in T1 

我想我應該用這樣的事情，但我不知道：

insert into t2 (col1,col2,col3) 
select 'const1','const2','const3' 
from t1 where not exists 
(select id from t1 t --...t1, I mean: insert 'const1'...and etc strings in t2 if 
--specified ID was not found in t1} 
where t.id='someID but not t2.id') 

Answer 1

INSERT INTO T1 (ID, Col1, Col2) 
SELECT ISNULL(T1.ID,-1), ISNULL(T1.Col1,'Arbatory Value'), ISNULL(T1.Col2,'Arbatory Value') 
FROM T2 
LEFT OUTER JOIN T1 
ON T2.ID = T1.ID 
WHERE T1.ID IS NULL