Check if MySQL entry exists and if it does, how to overwrite other columns?
For this, use INSERT ON DUPLICATE KEY UPDATE command. Let us first create a table −
mysql> create table DemoTable1891
(
FirstName varchar(20),
UNIQUE KEY(FirstName)
);
Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1891 values('Chris') on duplicate key update FirstName='Robert';
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1891 values('David') on duplicate key update FirstName='Robert';
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1891 values('Chris') on duplicate key update FirstName='Robert';
Query OK, 2 rows affected (0.00 sec)Display all records from the table using select statement −
mysql> select * from DemoTable1891;
This will produce the following output −
+-----------+
| FirstName |
+-----------+
| David |
| Robert |
+-----------+
2 rows in set (0.00 sec)
Published on 27-Dec-2019 11:18:48
