Question

I have a question on This MySQL statement.

I got this from this post

However, I am not sure how to structure the query when I have the table like this.

     TableA
     --------
     id ==> Auto Increment field
     question_id
     form_id
     member_id
     event_id
     admin_id 
     desc
     is_cand_field
     c_field_id

In this, question_id, form_id, memmber_id, event_id, admin_id can be same. desc, is_cand_field, c_field_id can change. When inserting, I want to check if this combination exists. If exists, I want to update the last 3 fields. If not, I want to insert a record.

Is this possible with the above referred query. Its not clear from the page.

Answer 1

1. Add unique key on combination of these fields:

   ALTER TABLE `tablea` ADD UNIQUE INDEX `compound_key` (`question_id`, `form_id`, `member_id`, `event_id`, `admin_id`);
   

2. Insert values and add update section:

   INSERT INTO tablea (`question_id`, `form_id`, `member_id`, `event_id`, `admin_id`, `desc`, `is_cand_field`, `c_field_id`)
   VALUES (1, 2, 3, 4, 5, 1, 0, 1)
   ON DUPLICATE KEY UPDATE `desc` = VALUES(`desc`), is_cand_field = VALUES(`is_cand_field`), c_field_id = VALUES(`c_field_id`)