不知道如何删除它，但这已经解决了。谢谢！
编辑：根据要求，完整存储的过程代码位于底部
在我正在编写的这个存储过程中，我遇到了一个非常奇怪的问题，即来自 mysql 的结果集不一致。我已经包含了我正在使用的调试语句及其输出：
语句（这些都在连续的行中/完全按照书面形式出现在代码中）：
SELECT 'SELECT * FROM event_task';
SELECT * from event_task;
SELECT 'SELECT event_id FROM event_task';
SELECT event_id FROM event_task;
SELECT 'SELECT * FROM event_task WHERE event_id = 1';
SELECT * FROM event_task WHERE event_id = 1;
SELECT 'end select';
我得到的结果是：
mysql> call get_user_events(1);
+--------------------------+
| SELECT * FROM event_task |
+--------------------------+
| SELECT * FROM event_task |
+--------------------------+
1 row in set (0.01 sec)
+----+----------+---------+--------+----------+---------------------+---------------------+
| id | event_id | user_id | task | complete | created_at | updated_at |
+----+----------+---------+--------+----------+---------------------+---------------------+
| 1 | 1 | 1 | stuff | 0 | 2012-08-30 00:00:00 | 2012-08-30 00:00:00 |
| 2 | 1 | 2 | stuff2 | 1 | 2012-08-30 00:00:00 | 2012-08-30 00:00:00 |
+----+----------+---------+--------+----------+---------------------+---------------------+
2 rows in set (0.01 sec)
+---------------------------------+
| SELECT event_id FROM event_task |
+---------------------------------+
| SELECT event_id FROM event_task |
+---------------------------------+
1 row in set (0.01 sec)
+----------+
| event_id |
+----------+
| NULL |
| NULL |
+----------+
2 rows in set (0.01 sec)
+---------------------------------------------+
| SELECT * FROM event_task WHERE event_id = 1 |
+---------------------------------------------+
| SELECT * FROM event_task WHERE event_id = 1 |
+---------------------------------------------+
1 row in set (0.01 sec)
Empty set (0.01 sec)
+------------+
| end select |
+------------+
| end select |
+------------+
1 row in set (0.01 sec)
基本上，即使当我从 event_task 中选择 * 时我可以看到 event_ids 为 1，但当我重新查询 event_task 的 event_id 作为特定列时，我得到 NULL 值。
编辑：刚刚选择了以下用户ID：
SELECT 'SELECT user_id';
SELECT user_id;
结果是：
mysql> call get_user_events(1);
+----------------+
| SELECT user_id |
+----------------+
| SELECT user_id |
+----------------+
1 row in set (0.00 sec)
+---------+
| user_id |
+---------+
| 1 |
+---------+
1 row in set (0.00 sec)
根据要求：完整的存储过程代码
DELIMITER $$
DROP PROCEDURE IF EXISTS get_user_events$$
CREATE PROCEDURE get_user_events (IN user_id int)
/*
gets the user's events for the default page
grabs: image location, event title, date, location, number of tasks completed / total, and updates
*/
BEGIN
DECLARE done TINYINT(1) DEFAULT FALSE;
DECLARE loop_cnt INT DEFAULT 0;
DECLARE num_rows INT DEFAULT 0;
DECLARE event_id INT;
DECLARE update_cur CURSOR FOR
SELECT DISTINCT id FROM aggregate;
DECLARE CONTINUE HANDLER FOR NOT FOUND
SET done = TRUE;
DROP TABLE IF EXISTS tasks;
DROP TABLE IF EXISTS aggregate;
DROP TABLE IF EXISTS updates;
CREATE TEMPORARY TABLE tasks (id int, event_id int, complete tinyint(1));
CREATE TEMPORARY TABLE aggregate (id int, picture_location varchar(255), name varchar(255), date timestamp,
place varchar(255), num_tasks int, tasks_complete int, status_update varchar(5000));
CREATE TEMPORARY TABLE updates (event_id int, status_update varchar(255));
/*get basic event information*/
INSERT INTO aggregate (id, picture_location, name, date, place)
SELECT e.id,
e.picture_location,
e.name,
ed.date,
ep.place
FROM event e INNER JOIN event_user_map eum ON e.id = eum.event_id
LEFT JOIN event_place ep ON e.id = ep.event_id AND ep.vote_final = 1
LEFT JOIN event_date ed ON e.id = ed.event_id AND ed.vote_final = 1
WHERE eum.user_id = user_id;
/*grab the list of tasks so we can work with a small subset*/
INSERT INTO tasks
SELECT id, event_id, complete
FROM event_task
WHERE event_id IN (SELECT DISTINCT id FROM aggregate);
SELECT 'SELECT * FROM event_task';
SELECT * from event_task;
SELECT 'SELECT event_id FROM event_task';
SELECT event_id FROM event_task;
SELECT 'SELECT * FROM event_task WHERE event_id = 1';
SELECT * FROM event_task WHERE event_id = 1;
SELECT 'SELECT event_id FROM (SELECT * FROM event_task) as A';
SELECT event_id FROM (SELECT * FROM event_task) as A;
SELECT 'end select';
/*gets tasks*/
UPDATE aggregate SET num_tasks = (SELECT COUNT(*) FROM tasks WHERE event_id = id);
UPDATE aggregate SET tasks_complete = (SELECT COUNT(*) FROM tasks WHERE event_id = id AND complete = 1);
/*get updates*/
OPEN update_cur;
read_loop: LOOP
FETCH update_cur INTO event_id;
IF done THEN
LEAVE read_loop;
END IF;
INSERT INTO updates
SELECT event_id, status_update FROM event_update ORDER BY updated_at limit 3;
END LOOP;
UPDATE aggregate SET status_update = (SELECT group_concat(status_update) FROM updates u WHERE u.event_id = id);
SELECT * FROM aggregate;
END$$
DELIMITER ;