首先，我有一个名为目标
的表+----+-----------+---------------------+---------------------+
| id | member_id | created_at | updated_at |
+----+-----------+---------------------+---------------------+
| 8 | 4 | 2016-08-08 15:36:06 | 2016-08-08 15:36:06 |
| 9 | 4 | 2016-08-08 15:38:37 | 2016-08-08 15:38:37 |
| 10 | 4 | 2016-08-08 15:44:13 | 2016-08-08 15:44:13 |
| 11 | 4 | 2016-08-08 16:45:14 | 2016-08-08 16:45:14 |
| 12 | 4 | 2016-08-08 16:54:10 | 2016-08-08 16:54:10 |
| 13 | 4 | 2016-08-08 17:04:13 | 2016-08-08 17:04:13 |
| 14 | 4 | 2016-08-08 17:08:09 | 2016-08-08 17:08:09 |
| 15 | 4 | 2016-08-08 17:11:17 | 2016-08-08 17:11:17 |
| 16 | 4 | 2016-08-08 17:16:53 | 2016-08-08 17:16:53 |
| 17 | 4 | 2016-08-08 17:19:39 | 2016-08-08 17:19:39 |
| 18 | 4 | 2016-08-08 17:30:53 | 2016-08-08 17:30:53 |
| 19 | 4 | 2016-08-08 17:37:27 | 2016-08-08 17:37:27 |
| 20 | 4 | 2016-08-09 09:32:09 | 2016-08-09 09:32:09 |
| 21 | 4 | 2016-08-09 12:08:29 | 2016-08-09 12:08:29 |
| 22 | 4 | 2016-08-09 12:16:51 | 2016-08-09 12:16:51 |
| 23 | 4 | 2016-08-09 12:27:48 | 2016-08-09 12:27:48 |
| 24 | 4 | 2016-08-09 12:41:59 | 2016-08-09 12:41:59 |
+----+-----------+---------------------+---------------------+
# ... other rows omitted for brevity
然后是另一张名为 goal_cycles
的表格+----+---------+---------------------+---------------------+--------------+
| id | goal_id | start_date | end_date | cycle_status |
+----+---------+---------------------+---------------------+--------------+
| 14 | 8 | 2016-08-09 15:35:59 | 2016-08-18 15:35:59 | active |
| 15 | 9 | 2016-08-09 15:38:33 | 2016-08-13 15:38:33 | active |
| 16 | 10 | 2016-08-09 15:44:11 | 2016-08-11 15:44:11 | active |
| 17 | 11 | 2016-08-09 16:45:11 | 2016-08-14 16:45:11 | active |
| 18 | 12 | 2016-08-09 16:54:08 | 2016-08-13 16:54:08 | active |
| 19 | 13 | 2016-08-09 17:04:11 | 2016-08-13 17:04:11 | active |
| 20 | 14 | 2016-08-09 17:08:06 | 2016-08-12 17:08:06 | active |
| 21 | 15 | 2016-08-09 17:11:13 | 2016-08-10 17:11:13 | active |
| 22 | 16 | 2016-08-09 17:16:50 | 2016-08-10 17:16:50 | active |
| 23 | 17 | 2016-08-09 17:19:36 | 2016-08-16 17:19:36 | active |
| 24 | 18 | 2016-08-09 17:30:50 | 2016-08-12 17:30:50 | active |
| 25 | 19 | 2016-08-09 17:37:23 | 2016-08-12 17:37:23 | active |
| 26 | 20 | 2016-08-10 09:32:06 | 2016-08-14 09:32:06 | passive |
| 27 | 21 | 2016-08-10 12:08:26 | 2016-08-19 12:08:26 | passive |
| 28 | 22 | 2016-08-10 12:16:48 | 2016-08-14 12:16:48 | passive |
| 29 | 23 | 2016-08-10 12:27:44 | 2016-08-14 12:27:44 | passive |
| 30 | 24 | 2016-08-10 12:41:54 | 2016-08-19 12:41:54 | passive |
+----+---------+---------------------+---------------------+--------------+
# ... other rows omitted for brevity
THE TASK ：我需要为所有 目标 更新 goal_cycles ，其中 memberId = 4 以及以下方式 cycle_status = active 的位置;
cycle_status = passive start_date = start_date + 3days end_date = end_date + 3days 所以我编写了以下MySQL查询;
update goal_cycles gc
set gc.cycle_status = 'passive',
set gc.start_date = DATE_ADD(gc.start_date, INTERVAL 3 DAY),
set gc.end_date = DATE_ADD(gc.end_date, INTERVAL 3 DAY)
where gc.goal_id in (select g.id from goals g where g.member_id = 4)
and gc.cycle_status = 'active'
在我看来，这似乎是一个合法的 mysql查询 ，但我收到以下错误消息：
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'set gc.start_date = DATE_ADD(gc.start_date, INTERVAL 3 DAY),
set gc.end_date = ' at line 3
我是否需要MySQL专家指出此查询的确切问题以及如何根据任务要求正确修复它。
答案 0 :(得分：10)
你重复了set。它应该只出现在查询中的ONCE：
update table foo
set field1 = value1,
field2 = value2,
field3 = value3,
etc...
所以，不，这不是有效的语法。