MySQL Update on duplicate error - mysql

Question

I have two tables, EVENTS and EVENT_ATTENDEES.
I'd like to be able to attempt a row insert on event_attendees and if the call_sign and event_id already exist in the table, it should update the response for that row instead of inserting a new one.
Events Table
CREATE TABLE `events` (
`event_id` int(11) NOT NULL,
`created_by` varchar(1000) NOT NULL,
`event_type` varchar(1000) NOT NULL,
`event_name` varchar(1000) NOT NULL,
`event_start` datetime NOT NULL,
`event_end` datetime NOT NULL,
`max_attendees` varchar(10) NOT NULL,
`open_registration` varchar(10) NOT NULL
)
ALTER TABLE `events`
ADD PRIMARY KEY (`event_id`);
ALTER TABLE `events`
MODIFY `event_id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=11
Event Attendees
CREATE TABLE `event_attendees` (
`id` int(11) NOT NULL,
`event_id` int(11) NOT NULL,
`call_sign` varchar(10) NOT NULL,
`response` varchar(10) NOT NULL
)
ALTER TABLE `event_attendees`
ADD PRIMARY KEY (`id`),
ADD UNIQUE KEY `event_id_2` (`event_id`,`call_sign`),
ADD KEY `event_id` (`event_id`) USING BTREE;
ALTER TABLE `event_attendees`
MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=15;
ALTER TABLE `event_attendees`
ADD CONSTRAINT `event_id_fk` FOREIGN KEY (`event_id`) REFERENCES `events` (`event_id`) ON DELETE CASCADE ON UPDATE NO ACTION;
I have tried the below query, but constantly get an error (I have created an event that has event_id = 10):
INSERT INTO event_attendees
(event_id, call_sign, response)
VALUES
('10', '007', 'Declined')
ON DUPLICATE KEY UPDATE
response = VALUES('Declined')
" #1064 - 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 ''test')' at line 6"

Answer 1

There is no need of VALUES here. Modify your query as:
INSERT INTO event_attendees
(event_id, call_sign, response)
VALUES
('10', '007', 'Declined')
ON DUPLICATE KEY UPDATE
response = 'Declined'
From doc:
you can use the VALUES(col_name) function to refer to column values from the INSERT portion of the INSERT ... ON DUPLICATE KEY UPDATE statement
Here you can find more about VALUES function.