mysql 插入错误 1062

Question

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?...

Answer 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 IGNORE to ignore the error.
• Use REPLACE instead of INSERT to replace the old row with the new row.
• Attempt the INSERT knowing that the client-side will be alerted of the error.

Answer 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.

Answer 3

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.

Answer 4

您的 ID_category 键被声明为唯一的，因此您不能有两个具有相同值的条目。

Answer 5

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.