Ignoring Errors
 
Normally INSERT stops and rolls back when it encounters an
error.
 
By using the IGNORE keyword all errors are converted to
warnings, which will not stop inserts of additional rows.
 
The IGNORE and DELAYED options are ignored when you use ON
DUPLICATE KEY UPDATE.
 
Incompatibilities
 
MariaDB until 5.5.28
MySQL and MariaDB before 5.5.28 didn't give warnings for
duplicate key errors when using IGNORE.
You can get the old behaviour if you set OLD_MODE to
NO_DUP_KEY_WARNINGS_WITH_IGNORE
 
Examples
-------- 
CREATE TABLE t1 (x INT UNIQUE);
 
INSERT INTO t1 VALUES(1),(2);
 
INSERT INTO t1 VALUES(2),(3);
ERROR 1062 (23000): Duplicate entry '2' for key 'x'
SELECT * FROM t1;
 
+------+
| x |
+------+
| 1 |
| 2 |
+------+
2 rows in set (0.00 sec)
 
INSERT IGNORE INTO t1 VALUES(2),(3);
Query OK, 1 row affected, 1 warning (0.04 sec)
 
SHOW WARNINGS;
 
+---------+------+---------------------------------+
| Level | Code | Message |
+---------+------+---------------------------------+
| Warning | 1062 | Duplicate entry '2' for key 'x' |
+---------+------+---------------------------------+
 
SELECT * FROM t1;
 
+------+
| x |
+------+
| 1 |
| 2 |
| 3 |
+------+
 
See INSERT ON DUPLICATE KEY UPDATE for further examples
using that syntax.
 


URL: https://mariadb.com/kb/en/insert-ignore/