SQLJOINの難しさ-結合条件で行を制限する方法が必要なようです

Oracle 9i +、ROW_NUMBERを使用：

SELECT x.project_id,
       x.title,
       x.event_date,
       x.event_desc
  FROM (SELECT p.project_id,
               p.title,
               e.event_date,
               e.event_desc,
               ROW_NUMBER() OVER(PARTITION BY p.project_id
                                     ORDER BY e.event_date) AS rank
          FROM PROJECT p
     LEFT JOIN EVENT e ON e.project_fk = p.project_id
                      AND e.event_type = 301
         WHERE p.project_id IN (101,102,103)) x
 WHERE x.rank = 1

Oracle 9i +、WITHおよびROW_NUMBERの使用：

WITH example AS (
     SELECT p.project_id,
            p.title,
            e.event_date,
            e.event_desc,
            ROW_NUMBER() OVER(PARTITION BY p.project_id
                                  ORDER BY e.event_date) AS rank
       FROM PROJECT p
  LEFT JOIN EVENT e ON e.project_fk = p.project_id
                   AND e.event_type = 301
      WHERE p.project_id IN (101,102,103))
SELECT x.project_id,
       x.title,
       x.event_date,
       x.event_desc
  FROM example x
 WHERE x.rank = 1