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create table a (ID int, Name varchar(20))
insert into a values (5, 'Me')
create table b (ID int, Class varchar(20))
Insert into b values (13, 'Math')
Create table c (aID int, bID int)
INSERT INTO c VALUES ( (SELECT ID from a where Name='Me'), (SELECT ID from b where Class ='Math') )
SELECT * FROM c
aID
bID
5
13