Continue SQL query even on errors

try
mysql --force < sample_data.sql

Mysql help section says
 -f, --force         Continue even if we get an sql error.

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You could also use INSERT IGNORE

INSERT IGNORE INTO mytable
 (primaryKey, field1, field2)
VALUES
 ('1', 1, 2),
 ('1', 3, 4), //will not be inserted
 ('2', 5, 6); //will be inserted

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You can use INSERT... IGNORE syntax if you want to take no action when there's a duplicate record.

You can use REPLACE INTO syntax if you want to overwrite an old record with a new one with the same key.

Or, you can use INSERT... ON DUPLICATE KEY UPDATE syntax if you want to perform an update to the record instead when you encounter a duplicate.

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REF:

http://stackoverflow.com/questions/5366436/continue-sql-query-even-on-errors