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create table tableA (id int, val int, month text, index(id)); insert into tableA values (1,10,"2023-10"),(1,10,"2023-10"),(1,10,"2023-11"),(2,5,"2023-10"),(2,3,"2023-10"),(2,6,"2023-11"); create table tableB ( id int primary key, val int, foreign key (id) references tableA(id) ); insert into tableA (id, val) select id, sum(val) from tableA group by id; select * from tableA;

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