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Adding records with REPLACE INTO to mimic DELETE and INSERT
You can use REPLACE INTO that works like DELETE + INSERT. Let us first create a table −
mysql> create table DemoTable ( Id int, FirstName varchar(50) ); Query OK, 0 rows affected (0.60 sec)
Following is the query to create a unique index −
mysql> alter table DemoTable add unique id_index(Id); Query OK, 0 rows affected (0.41 sec) Records: 0 Duplicates: 0 Warnings: 0
Insert some records in the table using insert command. Since we have added duplicate records, the new record gets added i.e. replaced with the same Id with the previous record −
mysql> replace into DemoTable values(100,'Chris'); Query OK, 1 row affected (0.10 sec) mysql> replace into DemoTable values(101,'David'); Query OK, 1 row affected (0.13 sec) mysql> replace into DemoTable values(100,'Bob'); Query OK, 2 rows affected (0.16 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+------+-----------+ | Id | FirstName | +------+-----------+ | 100 | Bob | | 101 | David | +------+-----------+ 2 rows in set (0.00 sec)
Updated on: 01-Oct-2019
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