mysql on duplicate key ignore
INSERT INTO table_tags (tag) VALUES ('tag_a'),('tab_b'),('tag_c') ON DUPLICATE KEY UPDATE tag=tag;mysql on duplicate key ignore
INSERT INTO table_tags (tag) VALUES ('tag_a'),('tab_b'),('tag_c') ON DUPLICATE KEY UPDATE tag=tag;identify rows with 2 same column value and delete duplicate mysql
DELETE c1 FROM contacts c1
INNER JOIN contacts c2
WHERE
c1.id > c2.id AND
c1.email = c2.email;
Code language: SQL (Structured Query Language) (sql)Copyright © 2021 Codeinu
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