Question

(SQLite and C#)
I have this little problem. See those 2 tables. 1. is parent, 2. is child

I should get “broj_goluba” from parent table to match “par_m” and “par_z” in child table and later just display it in datagridview.

Foregin keys should help to get things done fast, but here when I write code I have much more lines of code opposed to not using foreign keys.

Could someone please help me and write down how my code (EDIT: SQL query) should look like when using foreign keys.

Answer 1

What I understand you need is that, but it doesn’t have to do anything with speed. Maybe you mean INDEX and not FOREIGN KEY.

SELECT BROJ_GOLUBA
FROM TABLE1
INNER JOIN TABLE2 ON (TABLE1.ID = TABLE2.PAR_M OR TABLE1.ID = TABLE2.PAR_J)

Or maybe you need BOTH values to be equal:

SELECT BROJ_GOLUBA
FROM TABLE1
INNER JOIN TABLE2 ON (TABLE1.ID = TABLE2.PAR_M AND TABLE1.ID = TABLE2.PAR_J)