mysql - If data exists UPDATE else INSERT SQL query - No foreign key -


i have problem, want make 1 query update if field exists, , insert new 1 if not. problem id not unique, cant use on duplicate key update

i tried if exists solution

   if exists (select * wordpress.wp_4_postmeta post_id=3466 , meta_key='_job_expires')     update wp_4_postmeta set meta_value='2017-06-25' post_id=3466 , meta_key='_job_expires'   else    insert wordpress.wp_4_postmeta (post_id,meta_key,meta_value) values (3466,'_job_expires','2017-09-25')

and tried rowcount 

update wordpress.wp_4_postmeta set meta_value='01-01-2685'   post_id=3471 if @@rowcount = 0        insert wordpress.wp_4_postmeta (post_id,meta_key,meta_value)        values (3471,'_job_expires','2017-09-25')

but no luck. how can in 1 query?

i'm additionally attaching pictures of database table, see going on. post_id not unique, there can lot of same post_id different meta_key-s.

enter image description here

enter image description here

this tried, on duplicate key no luck

insert wordpress.wp_4_postmeta (post_id, meta_key, meta_value)      values (3466, '_job_expires', '2011-06-25')     on duplicate key update meta_value='2011-06-25';

with got new row in table seen in picture below enter image description here

the proper solution on duplicate key update.

first, need unique key post_id, meta_key:

create unique index unq_postmeta_post_metakey on wordpress.wp_4_postmeta(post_id, meta_key);

then can use on duplicate key update:

insert wordpress.wp_4_postmeta (post_id, meta_key, meta_value)      values (3466, '_job_expires', '2017-09-25')     on duplicate key update meta_value='2017-06-25';

i note 2 dates different. intentional?


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