if statement - If exists in mysql not working - 


    if exists (select * pages pages.id = 21) update `pages` set `content`='updated' (`id`='21') else insert `pages` (`subject_id`) values ('102')

not working problem

try this

 insert `pages` (`subject_id`) values ('102')  on duplicate key update `content`='updated'   `id`='21'

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