问题
SQL query:
INSERT INTO `website_categorization`.`category_keyword` (
`ID` ,
`ID_Category` ,
`Keyword` ,
`Score`)
VALUES (
NULL , '18', 'free mail', ''
), (
NULL , '18', 'web email free', ''
)
MySQL said:
#1062 - Duplicate entry '18-free mail' for key 'ID_Category'
It shows this duplicate entry error even though there is no entry at row no 1062. ( ID is primary key, and unique(ID_Category,Keyword) ). Can u help me in this?...
回答1:
You already have a row in your database with the values '18' and 'free mail'. You can't have two such rows because of the unique constraint. You have some choices:
- Remove the original row and try your insert again:
DELETE FROM yourtable WHERE ID_Category = '18' AND Keyword = 'free mail'. - Remove the unique constraint to allow both rows to exist.
- Use
INSERT IGNOREto ignore the error. - Use
REPLACEinstead ofINSERTto replace the old row with the new row. - Attempt the
INSERTknowing that the client-side will be alerted of the error.
回答2:
Well, it means that the data you are inserting breaks the unique constraints. From the error messasge I'd say some data already exists with the pair (18, 'free mail') - you say that is constrained to be unique.
The row number is not an indication, because it doesn't correspond to the key.
回答3:
Your ID_category key is declared as unique and thus you cannot have two entries with the same value.
回答4:
If your ID field is truly a primary key, it is mostly likely (or should be) auto-incremented. So leave that field out of the INSERT query.
回答5:
That is MySQL Error number 1062, not row number. The error means duplicate entry. You are inserting NULL and '18' twice in ID and ID_Category respectively, so it will throw this error the 2nd time you do it. ID_Category is very likely the name of your index. You can do a
show index from website_categorization.category_keyword
to see the index name.
来源：https://stackoverflow.com/questions/5775400/mysql-insert-error-1062