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Can we perform MySQL UPDATE and change nothing in a table?
Yes, we can do that. Let us first create a table −
mysql> create table DemoTable( Id int ); Query OK, 0 rows affected (1.02 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(201); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(202); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(290); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(301); 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 | +------+ | 201 | | 202 | | 290 | | 301 | +------+ 4 rows in set (0.00 sec)
Following is the query to perform MySQL UPDATE without changing anything −
mysql> update DemoTable set Id=Id where Id=290; Query OK, 0 rows affected (0.08 sec) Rows matched: 1 Changed: 0 Warnings: 0
Let us check table records once again −
mysql> select *from DemoTable;
This will produce the following output. It displays the same result −
+------+ | Id | +------+ | 201 | | 202 | | 290 | | 301 | +------+ 4 rows in set (0.00 sec)
Updated on: 27-Sep-2019
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