php - PhPmyadmin SQL Query to insert meta_key & value IF another value exist -


ok looking sql query insert meta_key & value in specific table if value exist. using wordpress database.

i want query search "wp_postmeta" table "qty (meta_key)" "0 (meta_value)" , insert posts new meta_key "_wplp_post_front" meta_value "1"

i new phpmyadmin , need help.

________________________update!!!
ok once again have found solution third party website:

insert wp_postmeta (meta_key, meta_value, post_id) select "_wplp_post_front", 1, post_id  wp_postmeta outside_table  meta_key = 'qty'  , meta_value = '0'  , not exists  (select * wp_postmeta post_id = outside_table.post_id , meta_key = "_wplp_post_front" , meta_value = 1 )

ok once again have found solution third party website:

insert wp_postmeta (meta_key, meta_value, post_id) select "_wplp_post_front", 1, post_id  wp_postmeta outside_table  meta_key = 'qty'  , meta_value = '0'  , not exists  (select * wp_postmeta post_id = outside_table.post_id , meta_key = "_wplp_post_front" , meta_value = 1 )

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