Answer:
The query will return four (4) rows
Explanation:
(See attachment below for the table)
The query will return rows where ORDERID is the same on both tables i.e. table ORDERS and ORDERLINES.
The similar rows (on column ORDERID) are 1897 and 87; for table ORDERLINESS and table ORDERS.
But on table ORDERLINESS, there are three rows with 1897 (under ORDERID column).
In total, they have 4 rows in common which are
ORDERID
1897
1897
1897 and
87
