Kui palju ridu saab minimaal ja maksimaal saada, tehes vasakpoolse ühenduse kahe tabeliga, millel on 10 ja 50 rida?

In a LEFT JOIN between table A (10 rows) and table B (50 rows), the minimum and maximum number of rows in the result depends on the matching of rows between the tables.

• Minimum number of rows: 10 — if for each row in table A there are no matching rows in table B, then each row from A will appear exactly once in the result with NULL in the B fields.

• Maximum number of rows: 10 × 50 = 500 — if each row in table A matches all 50 rows in table B, then each of the 10 rows of A will be repeated 50 times.

Therefore, the result of a LEFT JOIN can contain from 10 to 500 rows, depending on the number of matches between the tables.