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Replace a specific duplicate record with a new value in MySQL
Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(50) ); Query OK, 0 rows affected (0.62 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Name) values('Chris');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(Name) values('Robert');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(Name) values('Chris');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable(Name) values('David');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(Name) values('Mike');
Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+--------+ | Id | Name | +----+--------+ | 1 | Chris | | 2 | Robert | | 3 | Chris | | 4 | David | | 5 | Mike | +----+--------+ 5 rows in set (0.00 sec)
Here is the query to replace a specific duplicate record i.e. the name “Chris” here with a new name −
mysql> update DemoTable set Name=replace(Name,'Chris','Adam Smith'); Query OK, 2 rows affected (0.17 sec) Rows matched: 5 Changed: 2 Warnings: 0
Let us check the table records once again −
mysql> select *from DemoTable;
This will produce the following output −
+----+------------+ | Id | Name | +----+------------+ | 1 | Adam Smith | | 2 | Robert | | 3 | Adam Smith | | 4 | David | | 5 | Mike | +----+------------+ 5 rows in set (0.00 sec)
Updated on: 03-Oct-2019
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