新表中的MySQL更新列，包含來自另一個表的內容（移動）

Question

我有這些表（編輯出相關的字段）

mysql> desc studentcourseplan;
+-------------------+--------------+------+-----+---------+----------------+
| Field             | Type         | Null | Key | Default | Extra          |
+-------------------+--------------+------+-----+---------+----------------+
| cpl_id            | int(11)      | NO   | PRI | NULL    | auto_increment |
| student_id        | int(11)      | YES  | MUL | NULL    |                |
+-------------------+--------------+------+-----+---------+----------------+


mysql> desc studentdates;
+-----------------------+---------+------+-----+---------+----------------+
| Field                 | Type    | Null | Key | Default | Extra          |
+-----------------------+---------+------+-----+---------+----------------+
| student_date_id       | int(11) | NO   | PRI | NULL    | auto_increment |
| student_id            | int(11) | YES  |     | NULL    |                |
| student_date_cpl_id   | int(11) | YES  |     | NULL    |                |
+-----------------------+---------+------+-----+---------+----------------+

我想使用以下查詢將studentdates.student_date_cpl_id列studentcourseplan.cpl_id到studentdates.student_date_cpl_id （以排除重復項）

SELECT cpl_id FROM studentcourseplan
    WHERE student_id NOT IN ('50', '51', '85', '86', '90', '95', '89', '91', '92', '93', '94', '97', '98', '99', '100', '88')

當我執行正常的INSERT INTO studentdates.student_date_cpl_id SELECT ......它會添加到新行，並且不會更新當前行。 我怎么做到這一點？

Answer 1

Update  studentdates s,studentcourseplan sp
SET s.student_date_cpl_id = sp.cpl_id
where s.student_id=sp.student_id            
and s.student_id not in('50', '51', '85', '86', '90', '95', '89', '91', '92', '93', '94', '97', '98', '99', '100', '88')

Answer 2

嘗試這樣的事情

INSERT INTO studentdates.student_date_id,
     studentdates.student_date_cpl_id
select .... (join your tables)

ON DUPLICATE KEY UPDATE studentdates.student_date_cpl_id = studentcourseplan.cpl_id