テーブルの従業員:
+----+------------+
| id | firstname |
+----+------------+
| 1 | name1 |
+----+------------+
テーブルオーダー:
+----+--------+
| id | eid |
+----+--------+
| 1 | 2 |
+----+--------+
1 つのクエリでこの結果を取得できますか?
+----+--------+
| id | eid |
+----+--------+
| 1 | name1 |
+----+--------+