创建触发器以在创建新行时将主键从一个表插入到 MySQL 中另一个表的列中

Question

I have two tables I'm working with: Records and Invoice. Invoice contains a column for the primary key of Records to be stored as a foreign key.

I'm looking to create a trigger. Immediately when a new row is generated in Records, I want a new row to also be created in Invoice, and I want the PK from Records to be inserted into the corresponding column in invoice.

For example, let's say the tables are Records(RecordsID) and invoice(invoiceID, RecordsID)

When new row created in tbl Records     
Create new row in tbl Invoice and insert new Records.RecordID into new invoice.invoiceID

I'm aware this is most likely very far off, but here is the trigger I've been working on:

DELIMITER $$

create trigger new_invoice
after insert
on main for each row
begin
if new.RecordID is not null then
insert into invoice(RecordID)
values(new.RecordID(new.RecordID));
END IF;

END$$
DELIMITER ;

Any assistance will be greatly appreciated. Thank you.

Answer 1

Yes you have it almost right

CREATE tABLE main(RecordID int)

 CREATE tABLE invoice (RecordID int)

 create trigger new_invoice after insert on main for each row begin if new.RecordID is not null then insert into invoice(RecordID) values(new.RecordID); END IF; END

 INSERT INTO main VALUES (1)

 SELECT * FROM invoice

 |  RecordID | |  -------: |  |  1 | 

db<>fiddle here