On duplicate key ignore?

mysql
Good-bye picture Good-bye · Mar 2, 2010 · Viewed 188.5k times · Source

I'm trying to finish this query; my tag field is set to UNIQUE and I simply want the database to ignore any duplicate tag. 

INSERT INTO table_tags (tag) VALUES ('tag_a'),('tab_b'),('tag_c')
ON DUPLICATE KEY IGNORE '*the offending tag and carry on*'

or even this would be acceptable

INSERT INTO table_tags (tag) VALUES ('tag_a'),('tab_b'),('tag_c')
ON DUPLICATE KEY UPDATE '*the offending tag and carry on*'

Answer

thummper picture thummper · Feb 7, 2011

Would suggest NOT using INSERT IGNORE as it ignores ALL errors (ie its a sloppy global ignore). Instead, since in your example tag is the unique key, use:

INSERT INTO table_tags (tag) VALUES ('tag_a'),('tab_b'),('tag_c') ON DUPLICATE KEY UPDATE tag=tag;

on duplicate key produces:

Query OK, 0 rows affected (0.07 sec)

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