Question

I have a table, say, table2 that is connected with parent table, table1. I also have table3, which I want to copy its content to table2 that is connected to table1. Table3 may have some values in the foreign key column that are not available in table1 & this causes an error when I try to copy the values. How can I solve this problem in order to copy only the records that have a reference in the parent table ??

Answer 1

insert into table2 (col1, col2, ...)
select col1, col2, ... from table3
where table3.refcol in (select keycol from table1)

Of course you need to replace samples with actual column names. 🙂