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How to revert rows to default column value in MySQL?
To revert rows to default column value, let us first create a demo table
mysql> create table defaultDemo -> ( -> Id int -> ); Query OK, 0 rows affected (0.48 sec)
Insert some records in the table using insert command.
The query is as follows
mysql> insert into defaultDemo values(10); Query OK, 1 row affected (0.25 sec) mysql> insert into defaultDemo values(20); Query OK, 1 row affected (0.13 sec) mysql> insert into defaultDemo values(30); Query OK, 1 row affected (0.14 sec) mysql> insert into defaultDemo values(40); Query OK, 1 row affected (0.11 sec) mysql> insert into defaultDemo values(80); Query OK, 1 row affected (0.18 sec) mysql> insert into defaultDemo values(90); Query OK, 1 row affected (0.14 sec) mysql> insert into defaultDemo values(100); Query OK, 1 row affected (0.10 sec)
Display all records from the table using select statement.
The query is as follows
mysql> select *from defaultDemo;
The following is the output
+------+ | Id | +------+ | 10 | | 20 | | 30 | | 40 | | 80 | | 90 | | 100 | +------+ 7 rows in set (0.00 sec)
Here is the query to revert rows to default column value in MySQL
mysql> update defaultDemo set Id=default where Id > 45; Query OK, 3 rows affected (0.39 sec) Rows matched: 3 Changed: 3 Warnings: 0
Check the table records once again.
The query is as follows
mysql> select *from defaultDemo;
The following is the output
+------+ | Id | +------+ | 10 | | 20 | | 30 | | 40 | | NULL | | NULL | | NULL | +------+ 7 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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